PSLEAhmad 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 p.
- If p = 14, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= p + p + p + (3p - 4) + (p + 12)
= p + p + p + 3p + p - 4 + 12
= (7 p + 8) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of thread used if p = 14
= 7 p + 8
= 7(14) + 8
= 98 + 8
= 106 cm
Total length of thread not used
= 280 - 106
= 174 cm
1 cm = 0.01 m
174 cm = 1.74 m
Answer(s): (a) (7p + 8) cm; (b) 1.74 m