Question

PLEASEEEE HELPPPPP I WILL MARK U THE BRAINIEST Find the area swept by a clock’s minute hand in one hour. The length of the minute hand is 10.2 cm. What is the area swept in 30 minutes and 2 hours by the same hand?

Answer 1

ANSWER

Minute hand completes full circle degree in 60 minutes.

Angle swept by minute in 60 minutes =360°

Angle swept by the minute hand in 15minutes =60360°​×15=90°

Therefore,

θ=90°

Length of minute hand =r=14cm

Area swept by minute hand in 15 minutes =Area of sector

As we know that area of sector is given as-

A=360°θ​×πr2

Therefor,

Area swept by the minute hand in 15minutes =360°90°​×(722​×(14)2)=41​×616=154cm2

Hence the area swept by the minute hand in 15 minutes is 154cm2.

Hence the correct answer is 154cm2.

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Answer 2

Answer:

πrsq

Step-by-step explanation:

in 1 hr, π x 10.2 x 10.2

in 30 mins, 1/2 x π x 10.2 x 10.2

in 2 he's, 2 x π x 10.2 x 10.2