PSLEAndy had 3.3 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 w.
- If w = 21, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= w + w + w + (3w - 10) + (w + 19)
= w + w + w + 3w + w - 10 + 19
= (7 w + 9) cm
(b)
1 m = 100 cm
3.3 m = 330 cm
Total length of thread used if w = 21
= 7 w + 9
= 7(21) + 9
= 147 + 9
= 156 cm
Total length of thread not used
= 330 - 156
= 174 cm
1 cm = 0.01 m
174 cm = 1.74 m
Answer(s): (a) (7w + 9) cm; (b) 1.74 m