Question

Q.7 Find the cost of painting a die, which measure 12 mm at the rate of Rs 1 per square
centimetre.​

Answer 1

Answer:

Total Surface Area = 6 × 12^2 = 6× 144 = 864 mm^2

= 8.64 cm^2

Total cost = ₹(8.64 × 1) = ₹ 8.64

May my answer help you

Answer 2

Answer:

A die is in the shape of a cube

Side of die is given (a) = 12mm = 1.2 cm (as 1cm = 10 mm)

For painting we need surface area..

Surface area of cube = 6 a×a

here a = 1.2 cm

so , surface area of die = 6 × 1.2× 1.2 = 8.64 square cm

Cost per 1 square cm (given) = Rs 1

cost per 8.64 square cm = 1 × 8.64 = Rs 8.64