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Keerthana
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What is the angle in radian through which a pendulum swings and its length is 75 cm and the tip describes an arc of length 21 cm.

a

(325)R\left(\frac{3}{25}\right)^{\mathrm{R}}

b

(725)R\left(\frac{7}{25}\right)^{\mathrm{R}}

c

(421)R\left(\frac{4}{21}\right)^{\mathrm{R}}

d

(215)R\left(\frac{2}{15}\right)^{\mathrm{R}}

Answer : Option B
Explanation :
We know that, Angle = arc  radius ⇒θ=2175=\frac{\text { arc }}{\text { radius }} \Rightarrow \theta=\frac{21}{75} θ=(725)R\theta=\left(\frac{7}{25}\right)^{\mathrm{R}}
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