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