PSLEReggie had 3.8 m of string. He used some of it to make the figure as shown.
- How much of the string did Andy use to make the figure? Leave your answer in the simplest form in terms of k.
- If k = 26, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= k + k + k + (2k - 9) + (k + 17)
= k + k + k + 2k + k - 9 + 17
= (6 k + 8) cm
(b)
1 m = 100 cm
3.8 m = 380 cm
Total length of string used if k = 26
= 6 k + 8
= 6(26) + 8
= 156 + 8
= 164 cm
Total length of string not used
= 380 - 164
= 216 cm
1 cm = 0.01 m
216 cm = 2.16 m
Answer(s): (a) (6k + 8) cm; (b) 2.16 m