PSLEMichael had 2.8 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 d.
- If d = 12, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= d + d + d + (3d - 6) + (d + 13)
= d + d + d + 3d + d - 6 + 13
= (7 d + 7) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of thread used if d = 12
= 7 d + 7
= 7(12) + 7
= 84 + 7
= 91 cm
Total length of thread not used
= 280 - 91
= 189 cm
1 cm = 0.01 m
189 cm = 1.89 m
Answer(s): (a) (7d + 7) cm; (b) 1.89 m