Question

A conical fire work is of base diameter 10 cm & height 12 cm.10000 such fireworks are to be wrapped in colour paper.The price of the colour paper is 2 rupees per square meter. What is the total cost?​

Answer 1

Answer:

Side of the square = 5 cm

Base of the isosceles triangle = 5 cm

Height of the isosceles triangle = 8 cm

Area of the square = (side)2 = (5 cm)2 = 25 cm2

Area of one isosceles triangle =

Area of four isosceles triangles = 20 × 4 cm2 = 80 cm2

Area of the square pyramid = Area of the square + Area of four isosceles triangles

= (25 + 80) cm2

= 105 cm2

Thus, we need 105 cm2 paper for the job.