Cho tam giác ABCD là hình vuông cạnh 4cm (hình vẽ). Khi đó, độ dài đường chéo AC là:

AC = 32 \sqrt{32} 3 2 <path d="M95,702c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5, -10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8, -50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0, 35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5, -221c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467 s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422 s-65,47,-65,47z M834 80H400000v40H845z"> cm

AC = 30 \sqrt{30} 3 0 <path d="M95,702c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5, -10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8, -50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0, 35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5, -221c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467 s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422 s-65,47,-65,47z M834 80H400000v40H845z"> cm

Câu 7: Tam giác nhọn ABC. Kẻ AH ⊥ \perp ⊥ BC. Biết AH = 3cm, BH = 4cm, HC = 5cm. Chu vi tam giác ABC là

A.14+ 34 \sqrt{34} 3 4 <path d="M95,702c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5, -10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8, -50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0, 35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5, -221c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467 s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422 s-65,47,-65,47z M834 80H400000v40H845z"> (cm)

B. 15+ 35 \sqrt{35} 3 5 <path d="M95,702c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5, -10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8, -50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0, 35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5, -221c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467 s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422 s-65,47,-65,47z M834 80H400000v40H845z"> (cm)

Câu 9: Cho hình vẽ sau, chu vi tam giác ABC là:

A. 29 + 74 + 9 \sqrt{29}+\sqrt{74}+9 2 9 <path d="M95,702c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5, -10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8, -50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0, 35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5, -221c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467 s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422 s-65,47,-65,47z M834 80H400000v40H845z"> + 7 4 <path d="M95,702c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5, -10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8, -50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0, 35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5, -221c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467 s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422 s-65,47,-65,47z M834 80H400000v40H845z"> + 9 cm

B. 21 + 24 + 9 \sqrt{21}+\sqrt{24}+9 2 1 <path d="M95,702c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5, -10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8, -50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0, 35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5, -221c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467 s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422 s-65,47,-65,47z M834 80H400000v40H845z"> + 2 4 <path d="M95,702c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5, -10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8, -50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0, 35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5, -221c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467 s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422 s-65,47,-65,47z M834 80H400000v40H845z"> + 9 cm

C. 28 + 70 + 9 \sqrt{28}+\sqrt{70}+9 2 8 <path d="M95,702c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5, -10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8, -50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0, 35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5, -221c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467 s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422 s-65,47,-65,47z M834 80H400000v40H845z"> + 7 0 <path d="M95,702c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5, -10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8, -50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0, 35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5, -221c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467 s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422 s-65,47,-65,47z M834 80H400000v40H845z"> + 9 cm

Luyện tập định lý pytago

Authored by Hoàng Loan 18

Mathematics

7th Grade

Used 44+ times

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

Tính cạnh góc vuông của một tam giác vuông biết cạnh huyền bằng 13cm, cạnh góc vuông kia bằng 12cm.

5 cm

25 cm

313 cm

$\sqrt{313}$ cm

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Tính đường chéo của một mặt bàn hình chữ nhật có chiều dài 10dm, chiều rộng 5dm.

$\sqrt{75}$ dm

$\sqrt{125}$ dm

75 dm

125 dm

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Hãy chọn ra các bộ ba có thể là độ dài ba cạnh của một tam giác vuông.

5, 12, 13

2, 3, 4

9, 12, 14

8, 15, 18

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Dựa vào hình vẽ, Tìm x.

12 cm

$\sqrt{69}$ cm

69 cm

$\sqrt{12}$ cm

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Đoạn lên dốc từ C đến A dài 8,5m, độ dài CB bằng 7,5m (h.128).
Tính chiều cao AB.

7,5

$\frac{\sqrt{514}}{2}$

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

$\Delta\ ABC$ có $AB^{2\ }=\ AC^2+BC^2$ thì
$\Delta\ ABC$

vuông tại A

vuông tại B

vuông tại C

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Hãy chọn phát biểu đúng

Trong một tam giác, bình phương của một cạnh bằng tổng các bình phương của hai cạnh còn lại.

Trong một tam giác vuông, cạnh huyền bằng tổng các bình phương của hai cạnh góc vuông.

Trong một tam giác vuông, bình phương cạnh huyền bằng tổng các bình phương của hai cạnh góc vuông.

Trong một tam giác vuông, cạnh huyền bằng tổng của hai cạnh góc vuông.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Cho tam giác ABC vuông cân tại A. Tính độ dài cạnh BC biết AB = AC = 2dm

$BC=4\ dm$

$BC=\sqrt{6}\ dm$

$BC=8\ dm$

$BC=\sqrt{8}\ dm$

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Cho hình vẽ. Tính độ dài cạnh AB

$AB=7$

$AB=\sqrt{8}$

$AB=\sqrt{78}$

$AB=\sqrt{80}$

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Luyện tập định lý pytago

Tính cạnh góc vuông của một tam giác vuông biết cạnh huyền bằng 13cm, cạnh góc vuông kia bằng 12cm.

Tính đường chéo của một mặt bàn hình chữ nhật có chiều dài 10dm, chiều rộng 5dm.

Hãy chọn ra các bộ ba có thể là độ dài ba cạnh của một tam giác vuông.

Dựa vào hình vẽ, Tìm x.

Đoạn lên dốc từ C đến A dài 8,5m, độ dài CB bằng 7,5m (h.128).Tính chiều cao AB.

Δ ABC\Delta\ ABCΔ ABC có AB2 = AC2+BC2AB^{2\ }=\ AC^2+BC^2AB2 = AC2+BC2 thì \Delta\ ABCΔ ABC

Hãy chọn phát biểu đúng

Cho tam giác ABC vuông cân tại A. Tính độ dài cạnh BC biết AB = AC = 2dm

Cho hình vẽ. Tính độ dài cạnh AB

Tam giác nào là tam giác vuông trong các tam giác có độ dài ba cạnh nhưsau:

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Đoạn lên dốc từ C đến A dài 8,5m, độ dài CB bằng 7,5m (h.128).
Tính chiều cao AB.

$\Delta\ ABC$ có $AB^{2\ }=\ AC^2+BC^2$ thì
$\Delta\ ABC$

Tam giác nào là tam giác vuông trong các tam giác có độ dài ba cạnh như
sau: