Question

the length of the minute hand of a wall clock is 7cm find the area swept by it in 2hour's

Answer 1

Hi there!

The length of the minute hand will be the radius of the sector are which it will sweep.

In 60 minutes (1 hr.) it sweeps 360°

So,
In 120 minutes (2 hr.) it will sweep 720° [It took revolutions, that area swept will also be counted]

Area of sector,

720/360 × π(7)²

2 × 22/7 × 7 × 7 cm²

308 cm²

Cheers!

Answer 2

This is the answer......