Question

A sector containing an angle of 140 is cut off from a circle of radius 9 cm and folded into a cone​

Answer 1

Answer:

The surface area of come = 99 cm2

Step-by-step explanation:

Central angle=140 degrees

Radius of circle=9 cm

Area of sector=0/360× πr2

Where 0 = Central angle

π = 22/7

Using the formula

Area of sector= 140/360 × 22/7 × (9)2

Area of sector= 14/4 × 22/7 ×9 = 11×9

Area of sector= 99cm2

Area of cone= Area of sector= 99 square cm

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