The length of a roller is 40 cm and its diameter is 21 cm . It takes 300 revolution to move once over to level the floor of a room . Find the area of a room in meter square
Answers
Answered by
0
roller in shape of cylinder so, it's curved surface area is
radius is 10.5 cm height is 40cm
=2πrh
=2×22×10.5×40/7
=2640 cm²
=26.4 m²
if it roll one time it covers 26.4 m² area
if it roll 300 times how much area it curves so,
1:300::26.4:?
=26×300
=7800 m²
so, area of room is 7800 m²
radius is 10.5 cm height is 40cm
=2πrh
=2×22×10.5×40/7
=2640 cm²
=26.4 m²
if it roll one time it covers 26.4 m² area
if it roll 300 times how much area it curves so,
1:300::26.4:?
=26×300
=7800 m²
so, area of room is 7800 m²
Answered by
6
Answer:
19.2m2
Step-by-step explanation:
length=40 cm
diameter=21 cm
radius= diameter/2=21/2=10.5 cm
LSA = 2*PIE*r*H
= 2*22/7*10.5*40
=2640 cm2
area of the room = LSA * revolutions
=2640 * 300
= 792000 cm2
= 79.2 m2
Similar questions