Q.A pendulum of length 14 cm oscillates through an angle of $18°$. Find the length of its path.

Step 1: $r=14$ cm, $\theta = 18°\times\frac{\pi}{180}=\frac{\pi}{10}$ radian. …

Model the pendulum's swing as an arc with radius = pendulum length, convert the swin …

• Using the angle in degree directly in s = rθ instead of converting to radian first.
• Simplification slip on 14π/10 (should reduce to 7π/5, not left unreduced or wrongly reduced). …