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F.4 Maths Question

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發問:

1. a sector OAB where ∠AOB = 50° and P is the mid-point of OB. If the radius of sector is 18 cm, find the area of the shaded region.

最佳解答:

OP= 9 cm Area of ?OPA=(1/2)(18)(9)sin50°=81sin50° (cm2) Required area =Area of sector ? Area of ?OPA =182(50/360)π ? 81sin50° ≈79.322 cm2

其他解答:A215E4A2B88AAE64
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