Question

Q.1. A road roller of radius 1.4cm makes 10 revolutions. The total distance covered by it.​

Answer 1

★Given :

• Radius of road roller = 1.4 cm
• No.of. revolutions = 10  

★To find :

• The total distance covered by it.

★Solution :

Here, the distance covered in one revolution will be the circumference.That is,

Circumference of the roller = 1 revolution made by the roller

Using the formula,

✦Circumference = 2πr

Circumference of the road roller:-

→2πr

→2(22/7)1.4

→8.8cm

The total distance covered by the roller:-

Given that the roller makes 10 revolutions.Hence, total distane covered will be the distance covered by 1 revolution multiplied by 10.That is,

Distance covered in one revolution = 8.8 cm

Then distance covered in 10 revolutions is,

→ 10×(The distance covered in 1 revolution)

→ 10 × 8.8

→ 88 cm

Thus, the total distance covered by the road roller is 88 cm.

_____________

Answer 2

Given :-

• Radius of road roller = 1.4 cm
• No. of revolutions = 10

To find :-

• The total distance covered by it.

Solution :-

• Here, The distance covered in one revolution will be the circumference. That is,
• Circumference of the roller = 1 revolution made by the roller.

Using the formula

↝$\boxed{\sf{Circumstance = 2πr}}$

★ Circumstance of the roller road :

→ 2πr

→ ${\bf{2( \frac{22}{7} )1.4}}$

→ 8.8 cm

The total distance covered by the roller :

Given that the roller makes 10 revolutions.

Hence, Total distance covered will be the distance covered by 1 revolution multiplied by 10. That is,

Distance covered in one revolution = ${\rm\underline{8.8 cm}}$

The distance covered in 10 revolutions is,

→ 10 × (The distance covered in 1 revolution)

→ 10 × 8.8

→ 88 cm

Hence,

• Thus, the total distance covered by the road roller is $\boxed{\sf{88 cm}}$