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Mathematics for IGCSE & O level - Mensuration (Section 3 - No. 29)

If the area of a sector is 1/4πr², what is the angle of the sector?
60°
90°
45°
120°

解释

Area of sector = (θ/360) * πr². 1/4πr² = (θ/360) * πr². θ/360 = 1/4. θ = 90°.

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