Question

The sheet of metal has dimensions 56 cm by 33 cm. It sis melted down

and recast into discs of the same thickness and radius 7 cm. How many
disces will be cast ?

Answer 1

12 discs

Explanation:

Sheet metal has dimensions of 56 cm by 33 cm. This indicates that it is a rectangle.

A_rectangle = length × width

A_rect = 56 × 33

A_rect = 1848 cm²

It is now melt down and recast into disc's of 7 cm radius and similar thickness.

Thus;

Area of one disc = πr² = π × 7² = 49π

Thus,number of disc's cast = 1848/49π

number of disc's cast = 12