Question

Circular discs of radius 3.5cm are to be cut from a rectangular sheet of cardboard measuring 50cm by 30cm. once the disc are cut out, the remaining parts of the sheet are waste.
A. how many disc can be cut from one sheet of cardboard?
B. If % waste = waste/total area x 100,calculate the percentage waste fo this sizeof cardboard sheet.
diameter = 2r

30/7 = 4

50/7 = 7

Area used = 28 * πr^2 = ?

Subtract ? from 50*30 for waste

Related Questions

As many 8cm diameter discs as possible are cut from a sheet of rectangular cardboard measuring 170cm... Donna wants to cut out circular discs of radius 7cm from a cardboard measuring 50cm by 70cm. What is... a blacksmith has a rectangular iron sheet with the length of 10 cm. he has to cut out 7 circular dis... Alex wants to cut out as many circular badges as possible from this rectangular sheet of cardboard...