Question

2 The eage of a cube 6 m. It is to be painted at the rate of 30 per m'. Find the cost of painting of
the cube​

Answer 1

Given:

• Side of cube : 6cm = a

• Rate of painting : Rs 30 per m²

To find :

• Cost of painting the cube

• TSA of the cube

Solution:

TSA of cube : 6a²

⇒6 (6)²

⇒6 × 36

= 216cm²

Rate of painting : Rs 30 per m²

Cost of painting : 216 × 30

= Rs 648

Answer 2

Correct Question:-

The edge of a cube 6 m. It is to be painted at the rate of Rs.30 per m². Find the cost of painting of the cube.

Answer:-

Given:

▪︎Edge of cube = 6m

▪︎Rate of painting = Rs.30 per m²

To Find:

▪︎Cost of painting of cube

Solution:

Total surface area to be painted

= T.S.A. of cube

= 6×(side)²

= 6 × (6)²

= 6 × 36

= 216m²

Cost of painting of cube

= T.S.A. × Rate of painting

= 216 × 30

= Rs.6480

Formula to be remembered:-

▪︎T.S.A. of cube = 6 × (side)²

▪︎L.S.A. of cube = 4 × (side)²

▪︎Volume of cube = (side)³

▪︎T.S.A. of cuboid = 2(lb+bh+hl)

▪︎L.S.A. of cuboid = 2(l+b)×h

▪︎Volume of cuboid = l × b × h