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If the angle of the sector with radius 4 units is 45°, then find the length of the sector.
Solution:
Area = (θ/360°) × πr2
= (45°/360°) × (22/7) × 4 × 4
= 44/7 square units
The length of the same sector = (θ/360°)× 2πr
l = (45°/360°) × 2 × (22/7) × 4
l = 22/7
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