Question

The length of the minute hand of a clock is 3.5cm.Find the area swept by minute hand in 30 minutes

Answer 1

Answer:

30 mins in clock forms a semi circle

area of semi circle is pi×r²÷2

pi=22/7

radius is length of minute hand

so,22/7×3.5×3.5

22/7×35/10×35/10

11×1×35/10=385/10

therefore area is 385/10=38.5cm²

Answer 2

Answer:

area of circle = (πr²)*A/360

A° = (30/60)*360°

A = 180°

length of the hand = radius of semicircle

area = (22/7) * 3.5 * 3.5 * 1/2

= 19.25 cm²

final answer- 19.25 cm²