Question

The diameter of a roller is 77cm and it's length is 105cm. It takes 600 revolution moving once over, to level a playground. Find the area of the playground in m2

Answer 1

Answer:

given the length of the roller is 105m and diameter is 77cm

therefore radius of the roller is 77/2cm

let height be it's length

CSA of the roller=2πrh

=2×22/7×77/2×105

=2×11×11×105

=22×1155

=25410cm²

in metres=25410/100

=254.1m²

if it takes 600 revolutions to level the playground then the area of the playground is =254.1×600

=152460m²

hence the final answer is 152460m²

Answer 2

$\huge \sf \underline{ \underline{Question}}$

The diameter of a roller is 77 cm and its length is 105 cm. It takes 600 revolutions moving

once over, to Jevel a playground. Find the area of the playground in m².

Given:-

• length of the roller is 105m
• diameter is 77cm

$\sf \therefore \: radius \: of \: the \: roller \: is \frac{ 77}{2}cm$

Solution:-

• let height be it's length

• CSA of the roller=2πrh

$\sf \: =2× \frac{22}{7}× \frac{77}{2}×105$

=2×11×11×105

=22×1155

=25410cm²

$\sf \: in \: metres = \frac{25410}{100 }$

=254.1m²

if it takes 600 revolutions to level the playground then the area of the playground is =254.1×600

=152460m²

Hence the final answer is 152460m²