PSLEJustin had 2.8 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 a.
- If a = 13, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= a + a + a + (2a - 6) + (a + 16)
= a + a + a + 2a + a - 6 + 16
= (6 a + 10) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of wire used if a = 13
= 6 a + 10
= 6(13) + 10
= 78 + 10
= 88 cm
Total length of wire not used
= 280 - 88
= 192 cm
1 cm = 0.01 m
192 cm = 1.92 m
Answer(s): (a) (6a + 10) cm; (b) 1.92 m