This task is about working out the circumference, circular and square area of a road sign.
The figure below shows a circular 50 km/h sign, punched out of a square sheet of metal of sides 60 cm. (Use  = 3.14 approx.) |
| a) |
What is the circumference of the outer circle? __________ cm |
| b) |
What is the area of the circular sign? __________ cm2 |
| c) |
What is the total area of sheet metal wasted in the four corners, after the sign is punched out?
__________ cm2 |
| d) |
The shaded ring has an inner diameter of 40 cm, and an outer diameter of 60 cm.
What is its area? __________ cm2 |