The circumstances of two circles is132 and 308cm respectively.what is the difference between the area of the large circle and that of the smaller circle?
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Let the bigger circle"s radius be R and smaller circle be r
Step-by-step explanation:
2πR = 308
πR = 154
R = 154×7÷22
R = 49
2πr = 132
πr = 66
r = 66×7÷22
r = 21 cm
area of larger circle = 22÷7 × 49 × 49 = 22×7×49 = 7546 cm2
Area of smaller circle = 22÷7×21×21 = 22×3×21 = 1386 cm2
difference of areas = 7546 - 1386 = 6160 cm2
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