Perimeter of Common Shapes

What is the perimeter of this shape?

• 30cm

• 32cm

• 60cm

• 20cm

What is the perimeter of a shape?

• The space inside the shape

• The edge or border of a shape

• Both A and B

• Neither A or B

How do you calculate the perimeter of a shape?

• Add all the sides together

• Multiply the length by the width

• Add the length and width together

• None of these options

The figures below have the same perimeter. ​

The perimeter of the rectangle is ​ (a)   and the perimeter of the triangle is ​ (b)   . In order to solve for x, since the perimeters are the same you need to set the two expressions ​ (c)   to each other and solve for x.

x is equal to ​ (d)   . The perimeter of both the rectangle and the triangle is ​ (e)   inches.

• 2x+16

• 3x+10

• equal

• 6

• 28

• subtract

• add

• x+8

• 9x+4

• x+12

George drew a rectangle EFGH. He enlarged the rectangle by a scale factor of 3 and labeled it JKLM. What is the perimeter of rectangle JKLM?​ (a)  

• 39 cm

• 360 cm

• 120 cm

• 78 cm

George drew a rectangle EFGH. He enlarged the rectangle by a scale factor of 3 and labeled it JKLM. What is the perimeter of rectangle JKLM?​ (a)  

• 39 cm

• 360 cm

• 120 cm

• 78 cm

George drew a rectangle EFGH. He enlarged the rectangle by a scale factor of 2 and labeled it JKLM. What is the perimeter of rectangle JKLM?​ (a)  

• 64 cm

• 32 cm

• 48 cm

• 120 cm

Determine the perimeter of this shape.

• 17 units

• 18 units

• 20 units

• 16 units

What is the perimeter of this shape?

• 19 mm

• 17 mm

• 18 mm

• 16 mm

What is the perimeter of this shape?

• 16 units

• 20 units

• 18 units

• 19 units