1.

find the area of road rolled by roller in 100 revolution whose diameter is 84 cm and length is 105 CM

Answer»

Step-by-step EXPLANATION:

As it is roller , it's shape is CYLINDER.

area rolled in one REVOLUTION = CSA of cylinder

PIE × r × h = 2×22÷7×42×105 ( as d=84, r= 42)

= 44×6×105

=27720 cm

area COVERED in 100 revolution = CSA ×100

=27,72,000 cm



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