PSLEGeorge had 3.3 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 s.
- If s = 14, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= s + s + s + (3s - 10) + (s + 12)
= s + s + s + 3s + s - 10 + 12
= (7 s + 2) cm
(b)
1 m = 100 cm
3.3 m = 330 cm
Total length of wire used if s = 14
= 7 s + 2
= 7(14) + 2
= 98 + 2
= 100 cm
Total length of wire not used
= 330 - 100
= 230 cm
1 cm = 0.01 m
230 cm = 2.3 m
Answer(s): (a) (7s + 2) cm; (b) 2.3 m