how much iron is needed to make a rod of lenght 90 cm & diameter 1.4 cm?
Answers
Answered by
1
Answer:
138.6cm^2
Step-by-step explanation:
Length of rod , l = 90 cm
diameter of rod , d = 1.4 cm
so, radius of rod , r = 1.4/2 = 0.7 cm
volume of rod = πr²l
= 22/7 × 0.7 × 0.7 × 90
= 22 × 0.1 × 0.7 × 90
= 22 × 0.7 × 9
= 198 × 0.7
= 138.6 cm³
hence, 138.6 cm³ iron is needed to make a rod of length 90 cm and diameter 1.4 cm.
Similar questions