PSLEIan had 3.2 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 w.
- If w = 30, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= w + w + w + (3w - 7) + (w + 14)
= w + w + w + 3w + w - 7 + 14
= (7 w + 7) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of wire used if w = 30
= 7 w + 7
= 7(30) + 7
= 210 + 7
= 217 cm
Total length of wire not used
= 320 - 217
= 103 cm
1 cm = 0.01 m
103 cm = 1.03 m
Answer(s): (a) (7w + 7) cm; (b) 1.03 m