PSLEJulian had 2.1 m of thread. He used some of it to make the figure as shown.
- How much of the thread did Andy use to make the figure? Leave your answer in the simplest form in terms of t.
- If t = 11, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= t + t + t + (2t - 9) + (t + 15)
= t + t + t + 2t + t - 9 + 15
= (6 t + 6) cm
(b)
1 m = 100 cm
2.1 m = 210 cm
Total length of thread used if t = 11
= 6 t + 6
= 6(11) + 6
= 66 + 6
= 72 cm
Total length of thread not used
= 210 - 72
= 138 cm
1 cm = 0.01 m
138 cm = 1.38 m
Answer(s): (a) (6t + 6) cm; (b) 1.38 m