- Messages
- 150
- Reaction score
- 235
- Points
- 53
4*45=180Plzz temme how to do question 17 part b, i dnt get the concept of it.
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s10_qp_22.pdf
180/360=0.5
ratio of angle =ratio of circumference
so half the circle would be painted
circumference /2 + circumference of a
2xbyx12/2 + 2xbyx8=87.96