Lesson 16

Find the perimeter of the polygon?

• 21cm

• 22cm

• 20cm

• 35cm

Answer explanation

When you walk around your shape you must count all the sides including the corners that you turn.

Perimeter is the ​ ​ around a​ shape.

Find the perimeter of the polygon.

• 38cm

• 22

• 28m

• 22m

Answer explanation

You must count all the "lines" around your shape.

Find the perimeter of the polygon

• 31in

• 24in

• I don't know

• 68in

Answer explanation

Add all the sides!

Find the perimeter of the square.

• 40

• 40yds

• 100yds

• I have no idea!

Answer explanation

Add all the sides, each side is 10 so 10+10+10+10=40

What is the perimeter of the equilateral triangle?

• What's an equilateral triangle?

• 15yds.

• 20yds

• 5yd

Answer explanation

An equilateral triangle has three sides that are equal. So, if one side measures 5yds, then the other two sides measure the same. 5+5+5=15

If the perimeter of the polygon is 72m. What is the length of the missing side?

• 30

• 42m

• 30m

• I need more information

Answer explanation

The perimeter is 72, so add the sides you know 18+24=42. Then subtract 72-42 to find the missing side or count up from 42 to 72.

If the perimeter of the polygon is 44m, then the missing length of the side is

Answer explanation

Add the lengths of the sides you know 9+9+15=33. Then subtract the perimeter from your answer. 44-33=11

What is the perimeter and area of the rectangle?

• p=18

  a=20

• p=9in

  a=20squared inches

• p=18in

  a=20square inches

• This question is too hard!

Answer explanation

Perimeter is length + length +width + width, add the sides 4+4+5+5=18

Area is length x width 5 x 4=20

What is the perimeter and area of the shape?

• p=12yds

  a=14 square yards

• I don't know

• a=12

  p=14

• a=12 square yards

  p=14 yds