Perimeter of Triangles

Find the perimeter of this triangle.

• 12 in

• 22 in

• 18 in

• 24 in

Find the perimeter of this triangle.

• 26 cm

• 30 cm

• 21 cm

• 16 cm

Find the perimeter of this triangle.

• 12 in

• 22 in

• 18 in

• 24 in

Find the perimeter of this triangle.

• 20 cm

• 35 cm

• 40 cm

• 12.5 cm

1. What is the perimeter of the triangle having sides 8cm, 9cm and 10cm?

Mathematical Equivalence

ON

The perimeter of the equilateral triangle is 15 inches. Select ALL equations that could be used.

(a)   ​ ​ (b)  

• 3x = 15

• x + x + x = 15

• x =153

• x = 15 – 3

The perimeter of the triangle shown is 17x units. The dimensions of the triangle are given in units. Which equation can be used to find the value of x?​ (a)   What is the perimeter of the triangle?​ (b)   units.

• 51

• 3

• 21

• 82

• 5

The perimeter of the triangle shown is 17x units. The dimensions of the triangle are given in units. Which equation can be used to find the value of x?​ What is the perimeter of the triangle?​ units.

• 51

• 3

• 21

• 82

• 5

The perimeter of the isosceles triangle is 365 millimeters. What is the length of the missing side?

c

163

202 mm

41 mm

38 mm

39 mm

Jose lives next to a triangular park. He likes to take his dog for a walk around the park on the weekend. If he makes 3 trips around the park how far does he walk?

• 17 units

• 25 units

• 51 units

• 102 units