PSLEHenry had 3.6 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 v.
- If v = 19, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= v + v + v + (2v - 10) + (v + 19)
= v + v + v + 2v + v - 10 + 19
= (6 v + 9) cm
(b)
1 m = 100 cm
3.6 m = 360 cm
Total length of thread used if v = 19
= 6 v + 9
= 6(19) + 9
= 114 + 9
= 123 cm
Total length of thread not used
= 360 - 123
= 237 cm
1 cm = 0.01 m
237 cm = 2.37 m
Answer(s): (a) (6v + 9) cm; (b) 2.37 m