Question

A minute hand of a table clock is 3cm long.how far does its tip moves in 20 minutes​

Answer 1

Step-by-step explanation:

Here,the movement of its tip will be the length of the arc made by it in 20 minutes.

At first,angle between the initial position of the hand and its position after 20 minutes=20/60×360=1/3×360=120⁰

Length of arc = 2πr×120⁰/360⁰

=2×3.14×3×1/3

=6.18cm

Hence,the tip of the clock will cover 6.18 cm in 20 minutes.

Answer 2

Answer:

For a minute hand , in a circular clock

r = 3cm

thetha = 20/60 x 360

= 120 °

Area Covered = Area of sector with theta 120 °

= Area of sector = theta / 360 x πr²

= 120/360 x 22/7 x 9

= 66/7

= 9.4 cm2

Thus, the minute hand covered 9.4cm² to move 20 minutes.

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