標題:
maths (area) --urgent
發問:
May cuts a semi-circle of diameter 20 cm from a piece of paper, and forms a right circular cone. Find the base radius of the cone and also the volume of the cone.
最佳解答:
The length of arc of the semi-circle = 20π/2 = 10π cm The base radius of the cone = 10π/2π = 5cm The height of the cone = √(10^2-5^2) = √75 the volume of the cone = 5^2π * √75 * 1/3 = 226 cm^3 (corr. to 3 sig. fig.)
其他解答:
maths (area) --urgent
發問:
May cuts a semi-circle of diameter 20 cm from a piece of paper, and forms a right circular cone. Find the base radius of the cone and also the volume of the cone.
最佳解答:
The length of arc of the semi-circle = 20π/2 = 10π cm The base radius of the cone = 10π/2π = 5cm The height of the cone = √(10^2-5^2) = √75 the volume of the cone = 5^2π * √75 * 1/3 = 226 cm^3 (corr. to 3 sig. fig.)
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