Relation between Inradius and Perimeter of Triangle
In a circle o...
Question
In a circle of radius 21 cm, an arc subtends an angle of 60^o at the centre. Find (i) the length of the arc, (ii) the area of the sector.
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Solution
Step 1: Find the length of the arc Lengthofthearc=(θ360°)×2πr=(60∘360°)×2π×21=22cm Step 2: Find the area of the sector. Areaofthesector=(θ360°)×πr2=(60∘360°)×π×212=231cm2