PSLEKen had 2.6 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 k.
- If k = 23, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= k + k + k + (2k - 4) + (k + 16)
= k + k + k + 2k + k - 4 + 16
= (6 k + 12) cm
(b)
1 m = 100 cm
2.6 m = 260 cm
Total length of thread used if k = 23
= 6 k + 12
= 6(23) + 12
= 138 + 12
= 150 cm
Total length of thread not used
= 260 - 150
= 110 cm
1 cm = 0.01 m
110 cm = 1.1 m
Answer(s): (a) (6k + 12) cm; (b) 1.1 m