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# Hello I need help for these  maths questions, thanks!? ### 1 Answer

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First make an attempt at solving these yourself. You've probably done some examples already. The two formulas you need for these problems are:

The area of a rectangle:

A(rectangle) = lw <-- length times width

The area of a circle:

A(circle) = πr² <-- pi times the radius squared

In problem 12:

1) What's the area of the rectangle?

2) What's the area of the circle?

3) Subtract the area of the circle from the area of the rectangle and what is left is the grassy area.

In problem 13:

They even give you some hints. Try following them.

In problem 14:

1) What's the total rectangular area?

2) Calculate the area of the patio and subtract that.

3) Calculate the area of each pond and subtract both of them.

What's left?

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