A square consists of a big square inside it whose dimensions are 1*1, a small square whose dimensions are 1/2*2/5, a rectangle whose dimensions are 1*2/5 and another rectangle with dimensions 1*1/2. Find the area of the whole square.

4 : -

The number of squares on vertical side of the grid are 10. And on the horizontal side are also 10.

So the area of whole grid is

= vertical side * horizontal side

= 10 * 10

= 100 units

This means that the grid is made of hundred unit squares.

5 : -

Area of diagram from Exercise. 4 is

= 10 * 10

= 100 units

6 : -

A grid consist of unit squares. Find the area of the grid using the number of unit squares.