Heron's formula class 9

1. The area of a triangle is 150 sq. cm. and its sides are in the ratio 3 : 4 : 5. What is its perimeter?

• 10 cm

• 40 cm

• 35 cm

• 60 cm

Tags

CCSS.6.G.A.1

What in the area of an equilateral triangle with side 2 cm?

• $\sqrt{6\ }cm^2$

• $\sqrt{8}cm^2$

• $\sqrt{3}cm^2$

• $4\ cm^2$

Tags

CCSS.6.G.A.1

3. What is the length of each side of an equilateral triangle having an area of 

 $4\sqrt{3}\ cm^2$  

• 4 cm

• 5 cm

• 3 cm

• 6 cm

Tags

CCSS.6.G.A.1

4. The sides of a triangle are 3 cm, 5 cm and 6 cm. What is its area?

• $2\sqrt{3}cm^2$

• $4\sqrt{14}cm^2$

• $5\sqrt{12}cm^2$

• $2\sqrt{5}cm^2$

Tags

CCSS.6.G.A.1

Length of one of the equal sides of an isosceles triangle is 4 cm. If its perimeter is 14 cm, then what is its area?

• $7\sqrt{3}cm^2$

• $3\sqrt{7}cm^2$

• $7\sqrt{7}cm^2$

• $21cm^2$

Tags

CCSS.6.G.A.1

If the perimeter of an equilateral triangle is 60 cm, then what is its area?

• $100\sqrt{2}cm^2$

• $200\sqrt{2}cm^2$

• $100\sqrt{3}cm^2$

• $200\sqrt{3}cm^2$

Tags

CCSS.HSG.SRT.D.9

The sides of a triangle are 15 cm, 17 cm and 8 cm. What is its area?

• $20\ cm^2$

• $40\ cm^2$

• $60\ cm^2$

• $80\ cm^2$

Tags

CCSS.6.G.A.1

The sides of a triangle are in the ratio of 3 : 4 : 5. If its perimeter is 36 cm, then what is its area?

• $32\ cm^2$

• $54\ cm^2$

• $67\ cm^2$

• $72\ cm^2$

Tags

CCSS.6.G.A.1

The area of triangle with given two sides 18 cm and 10 cm respectively and perimeter equal to 42 cm is:

• $20\sqrt{11}cm^2$

• $19\sqrt{11}cm^2$

• $22\sqrt{11}cm^2$

• $21\sqrt{11}cm^2$

Tags

CCSS.HSG.SRT.D.9

The sides of a triangle are in the ratio 12: 17: 25 and its perimeter is 540 cm. The area is:

• 1000 cm²

• 5000 cm²

• 9000 cm²

• 8000 cm²

Tags

CCSS.6.G.A.1