Finding Perimeter of Polygons

The distance around an object is called (a)  

• area

• perimeter

Answer explanation

The distance around an object is known as the perimeter. It measures the total length of the edges or boundaries of a shape, distinguishing it from area, which measures the space within the shape.

Tags

TEKS.MATH.3.7B

The perimeter of this square (with equal sides) is (a)  

• 4 in.

• 16 in.

• 8 in.

Answer explanation

The perimeter of a square is calculated by the formula P = 4s, where s is the length of one side. If the perimeter is 16 in., then each side is 4 in. (16 in. ÷ 4). Thus, the correct answer is 16 in.

Tags

TEKS.MATH.3.7B

The perimeter of this rectangle is (a)  

• 21 units

• 12 units

• 3 units

• None of the above.

Answer explanation

The perimeter of a rectangle is calculated as P = 2(length + width). If the perimeter is 12 units, it can be achieved with various length and width combinations, confirming that 12 units is the correct answer.

Tags

TEKS.MATH.3.7B

What is the perimeter?

• 9 units

• 12 sq units

• 12 units

• None of the above

Answer explanation

The perimeter is the total distance around a shape. In this case, the correct answer is 12 units, which indicates the total length of all sides combined, while 12 sq units refers to area, not perimeter.

Tags

TEKS.MATH.3.7B

What's the perimeter of this triangle?

• 10 cm

• 11 cm

• 12 cm

• 13 cm

Answer explanation

To find the perimeter of a triangle, add the lengths of all three sides. If the sides are 4 cm, 4 cm, and 4 cm, the perimeter is 4 + 4 + 4 = 12 cm. Therefore, the correct answer is 12 cm.

Tags

TEKS.MATH.3.7B

Ashley wants to use ribbon to put a border around her picture. The picture is 6 inches long and 4 inches wide. How much border will she need?

• 24 inches

• 20 inches

• 10 inches

Answer explanation

To find the border needed, calculate the perimeter of the picture. Perimeter = 2(length + width) = 2(6 + 4) = 2(10) = 20 inches. Therefore, Ashley needs 20 inches of ribbon for the border.

Tags

TEKS.MATH.3.7B

What is the perimeter of this polygon?

• 39 in

• 24 in

• 105 in

Answer explanation

To find the perimeter of the polygon, add the lengths of all its sides. The total length calculated is 39 inches, which matches the correct answer choice.

Tags

TEKS.MATH.3.7B

Match each polygon with its correct perimeter.

• A rectangle with sides 10 in and 4 in

• 49 ft

• A rectangle with sides 15 in and 9.5 in

• 28 ft

• A square with sides 7 ft

• 28 in

• A square with sides 12.25 ft

• 49 in

Tags

TEKS.MATH.3.7B

Calculate the perimeter of the trapezoid!

• 37ft.

• 24ft.

• 34ft.

Answer explanation

To find the perimeter of a trapezoid, add the lengths of all four sides. If the total is 37ft, then the correct answer is 37ft.

Tags

TEKS.MATH.3.7B

Farmer Bob's son built a track to walk his pet pig. The track goes around the pig pen. The pig pen is 15 feet long and 21 feet wide. If the pig walks all the way around the track, how many feet did he walk?

• 72 feet

• 36 feet

• 36 square feet

Answer explanation

To find the distance the pig walks around the track, calculate the perimeter of the pig pen. The formula for the perimeter is 2(length + width). Here, it's 2(15 + 21) = 2(36) = 72 feet. Thus, the pig walks 72 feet.

Tags

TEKS.MATH.3.7B