# 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?

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• Anonymous

wrong sweetness

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• 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

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• 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!

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• something is missing. must have the diameter. perhaps the triangle is drawn in the wrong location and the hypotenuse is the diameter of the circle.

anyway if you find out then area of circle minus area of triangle is the answer

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