Area of composite figures

In order to find area of composite figures, you need to break it down part by part.

For example see the example drawn.

We have a semi circle and we have a square.

When we break it down we take the semi-circle first.

To find the area of a semi-circle you do:

.

We know that the radius is 5 cm

So we do

.

Next we conquer the square:

.

We know that a square is symmetric hence:

.

Finally we sum them all together to get the composite area:

.

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use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.