Question

What is the approximate perimeter of a semicircle with a radius of 6 cm?

Use pi star times pi= 3.14.
Express your final answer to the nearest hundredth.

Answer 1

By any chance, what's the perimeter (circumference) of a circle? Do you know? ^^

Answer 2

ya

Answer 3

Okay, what is it?

Answer 4

c = pi*d

Answer 5

Yes..or C = 2 * pi * r

Answer 6

Right... but what if it's radius you're given?

Answer 7

then u just multiply it by 2 in ur head .-.

Answer 8

Lol

Answer 9

Just plug in what you know..the radius and 3.14 for pi..

Answer 10

Find it and then divide by 2, because it's a semi-circle.

Answer 11

Of course.
Now,we have a semicircle with radius 6.
If it was a circle instead, what would its perimeter (circumference) be?

Answer 12

right but its semi

Answer 13

Yes, so just find it and divide by 2..

Answer 14

\(C = 2 \pi r\)

\(C =~?\)

Answer 15

More like \(C = \dfrac{2 \pi r}{2}\)

Answer 16

18.84

Answer 17

Correct, that's our answer.