Question

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Answer 1

If you want, I can tell you the answer.

Answer 2

@stupidinmath?

Answer 3

Oh, sorry I made a mistake. The diameter of the circle is 18cm, not 9cm.

Answer 4

First, the diameter of the circle is 18cm. We all know the formula of a circle's perimeter is diameter*π. But in this imagine, there is not a circle, it is a part of it. It is 240/360 of a circle. Simplify 240/360, we get 2/3. Not the 2/3 perimeter of the circle, there are also two lines which are OA and OB. Both of them are 9cm. So the perimeter of the shaded region is the sum of 2/3 of the perimeter of the circle, OA and OB. Can you find the answer now?

Answer 5

All right. The answer is
18π+9+9
=18π+18
=74.52cm

Answer 6

omg thak you so much @Chineseboy15

Answer 7

You are welcome.

Answer 8

thank you @ikram002p :)