PSLEVaidev had 3.2 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 + 16)
= k + k + k + 2k + k - 9 + 16
= (6 k + 7) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of string used if k = 26
= 6 k + 7
= 6(26) + 7
= 156 + 7
= 163 cm
Total length of string not used
= 320 - 163
= 157 cm
1 cm = 0.01 m
157 cm = 1.57 m
Answer(s): (a) (6k + 7) cm; (b) 1.57 m