The area of the smallest circle which contains a square of area 4 cm2 inside is
Side of the square = √4 = 2 cm Diagonal of the square = 2 √2 The diameter of the circle = Diagonal of the square = 2√2 Radius of the circle = 2√2/2 = √2 ∴ Area of the circle = π × (√ 2)2 = 2π
The curved surface area of a hemisphere is 72π cm2, then its radius is:
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