# am i doing this correctly?

http://i66.photobucket.com/albums/h267/irvingtons_...

to find the area of the shaded region i did

12*12=144

16*16=256

i add them together and got 400

and did the sq root of 400 and got 20?

Relevance
• Anonymous

wrong sweetness

I think the drawing is wrong. The right angle perhaps is on the circumference of the circle in which case the side with a length of 20 units will be the diameter of the circle.

Then the shaded area is the area of circle - area of triangle.

= Pi * 10^2 - 1/2(12*16) {pi * r ^ 2 - 1/2(b * h) Take 12 as b and 16 as h

= 314 - 96

= 218 units

No u have done wrong...I mean wat u have done is, u have found the lenght of the 3rd side of the triangle (pythagorus theorm) , but ur question was how to find the area of the shaded part of the diagram = Area of circle - Area of triangle

Area of triangle = 1/2 * b*h= 1/2 * 12 * 16 = 96 cm2

Area of circle = 3.142 * (radius)2 = this is where I got stuck because u have to find the radius and as there is no centre given in the diagram , this makes the sum complicated......I hope there is nothing missing in ur diagram .

Anyways if I get it I will tell u.

Happy New Year!