The diameter of a right circular roller 120 cm long is 84 cm. How much area ( in square metre) of the ground will it roll in one complete revolution? ( use 22/7)
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Answer:
4.2768 m sq.
Step-by-step explanation:
For a right circular roller
Height(h) = 120cm
Diameter = 84 cm
Radius(r) = Diameter/2
= 84/2
= 42cm
Area of the ground it will roll in one complete revolution = Surface area of the right circular roller
Surface area of the right circular roller = 2 π r (r + h)
= 2 × 22/7 × 42 × (42 + 120)
= 2 × 22 × 6 × 162
= 42768 cm sq.
= 4.2768 m sq.
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