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