SSC CHSL 8 Jan 2017 Shift 1 Paper

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Question : 70 of 100

Marks: +1, -0

Find the radius of the circle if the length of its arc is 33 cm whose corresponding central angle is 90° ?

21 cm
14 cm
7 cm
28 cm

Solution:

Central angle

=θ=90 °

and let radius r = cm
Length of arc =

θ/360×2πr=33

⇒

90/360×2×22/7×r=33

=

1/4×44×r=33×7

cm
⇒

r={33×7}/11=21

cm

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