Question

How many circular coins each of radius 3.5cm and 1.5mm thickness show be melted to form a cube of edge 5cm? Write the answer the nearest whole number?

Answer 1

125 = πr^2 h

125 = 57.75 ×X. ( X is the no: of coins.)

X = 125÷ 57.75
X = 2.1645 coins

nearest whole number = 2 coins