Areas Related to Circles

⭐ Important Questions

1. Find area of quadrant of circle with circumference 22 cm.
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   2πr = 22 => r = 22x72x22 = 7/2 cm\nArea of quadrant = 14πr² = 14x227x494 = 778 = 9.625 cm²
2. A wheel makes 360 revolutions in 1 minute. Radius is 35 cm. Find speed in km/h.
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   Distance per rev = 2πr = 2x227x35 = 220 cm\nDistance per min = 360x220 = 79200 cm = 792 m\nSpeed = 792x60/1000 = 47.52 km/h