Question

Which has a larger area left out? Cutting 9 circles each of radius 7 cm from a square of side 42cm

Answer 1

Formulas :

Area of a circle is :

πr²

Taking π = 22/7

Area of the circle of radius 7cm
is :

(22 / 7) × 7 × 7 = 154 cm

For the 9 circles :

9 × 154 = 1386 cm²

Area of the square :

42 × 42 =1764cm²

The Area left out is :

1764 - 1386 = 378 cm²

The area left out is 378 cm²