how do i find the area of the shaded region?

Question

http://i66.photobucket.com/albums/h267/irvingtons_girl_power/math.jpg

can you walk me through because i want to be able to do it in class
thanks

Answer 1

what they said

Answer 2

Area of the whole circle is pi * r^2

If r = 6cm then

A = pi * 36 = 113.04 cm^2

72/360 = 1/5 or 20%

That means the shaded area is 80% (4/5) of the area of the circle

113.04 * .8 = 90.43cm^2

Answer 3

Assuming 6cm to be the radius,
Area of shaded region = (Pix6x6)[(360-72)/360]
=90.47786842cm²
=90.5cm²(to 3s.f)

First step,determine the angle that is shaded.
Which is 360-72=288
Take 288 divided by 360 to get the fraction of circle that is shaded.
Mutiply it by the total area to obtain the area of the shaded region.

Answer 4

area of disk -1/5 area of the disk = 4/5 area of disk

Note 72^o= 1/5(360^o)

The area of a disk is Pi*R^2 if R= 6cm

Shaded area = 4/5 *Pi*36cm^2

Answer 5

if it was complete circle, area is PI x R x R.
PI =3.142, R = radius, 6cm.
since you ignore the section of 72degrees, you get:
(360-72)/360 x (PI X R X R)
this = 0.8 X 36 x 3.142
this = 90.5 cm^2
ok??

g