Question

http://prntscr.com/3cfugp

Answer 1

What does that shape appear to be?

Answer 2

i don't know

Answer 3

It's a quarter of something?

Answer 4

square?

Answer 5

A circle.

Answer 6

@serenamoon, Do you see that if you had four of those it would make a circle?

Answer 7

oh

Answer 8

How can you calculate the perimeter of a circle? Sometimes called a circumference?

Answer 9

To do this just find the circumference, which is the same as the perimeter. Circumference = 2π × radius

Answer 10

The radius in this problem is 5. So plug that into the formula

Answer 11

ok

Answer 12

Now you have the perimeter of the entire circle. How would we get the perimeter of just the curve in the diagram?

Answer 13

b

Answer 14

Nope. To find the perimeter of just the quarter divide the circumference of the whole circle by 4.

Answer 15

Now that you have the perimeter of the curved part what's the perimeter of the entire shape?

Answer 16

c