PSLEJeremy had 2.7 m of wire. He used some of it to make the figure as shown.
- How much of the wire did Andy use to make the figure? Leave your answer in the simplest form in terms of d.
- If d = 22, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= d + d + d + (2d - 7) + (d + 20)
= d + d + d + 2d + d - 7 + 20
= (6 d + 13) cm
(b)
1 m = 100 cm
2.7 m = 270 cm
Total length of wire used if d = 22
= 6 d + 13
= 6(22) + 13
= 132 + 13
= 145 cm
Total length of wire not used
= 270 - 145
= 125 cm
1 cm = 0.01 m
125 cm = 1.25 m
Answer(s): (a) (6d + 13) cm; (b) 1.25 m