PSLEJohn had 3.7 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 h.
- If h = 15, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= h + h + h + (3h - 3) + (h + 19)
= h + h + h + 3h + h - 3 + 19
= (7 h + 16) cm
(b)
1 m = 100 cm
3.7 m = 370 cm
Total length of thread used if h = 15
= 7 h + 16
= 7(15) + 16
= 105 + 16
= 121 cm
Total length of thread not used
= 370 - 121
= 249 cm
1 cm = 0.01 m
249 cm = 2.49 m
Answer(s): (a) (7h + 16) cm; (b) 2.49 m