Consider a 72° angle inscribed in the centre of a circle with radius 10cm. (a) What is the length of the arc length formed by this angle? (b) What is the area of the sector formed by this angle?

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A: Let's name the point F :   To find: Arc AB.

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Q: Photo #1: Question Photo #2: Answer Key

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A: Figure:-

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A: Given,            The right triangle is shown below :

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A: Length of arc is d2θ where d is diameter and θ is angle in radians:  d2θ=72135180×π       =2.625π cm

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