Question

The area of sector AOB is 20.25pi cm^2 . Find the exact area of the shaded region.

Answer 1

find Area of triangle AOB and subtract it from sector area

Answer 2

The area of AOB is 20.25.

Answer 3

thats the given sector AOB area.

Answer 4

woops, its 63.585 if you multiply it by pi

Answer 5

Yes. thats the given **sector** area.

Answer 6

we need to remove the triangle area to get area of shaded region

Answer 7

The question asks for the _exact_ area, so just follow what ganeshie8 told you to do. Calculate the area of the triangle and subtract it from 20.25(pi) cm^2.
The answer should look like 20.25pi - _______ cm^2

Answer 8

Do I have to use Sin Cos Tan?

Answer 9

to find the height OA ?

Answer 10

OH. is it 9cm? Because its a radius?

Answer 11

Yes ! very good observation :)

Answer 12

Would it be 20.25pi - 81cm^2?
Because you have to times 9 and 9?

Answer 13

you have to times 9 and 9 and divide it by 2

Answer 14

area of triangle = bh/2

Answer 15

Oh, duhh. 40.5

Answer 16

Yes !