SSC JE Civil Engineering 30-Oct-2020 Shift 2 Paper

Explanation:
Given:
Radius of $4^{\mathrm{th}}$ step = 0.8 m
Calculation:
From the figure;
Radius of $3^{\mathrm{rd}}$ step = 0.8 + 0.3 = 1.1 m
Radius of $2^{\mathrm{nd}}$ step = 0.8 + 0.3 + 0.3 = 1.4 m
Radius of $1^{\mathrm{st}}$ step = 0.8 + 0.3 + 0.3 + 0.3 = 1.7 m
The radius of the circular steps in the order from $1^{\mathrm{st}}$ to $4^{\mathrm{th}}$ step is:
1.7 m, 1.4 m, 1.1 m, 0.8 m