PSLEKen 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 f.
- If f = 26, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= f + f + f + (2f - 10) + (f + 15)
= f + f + f + 2f + f - 10 + 15
= (6 f + 5) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of string used if f = 26
= 6 f + 5
= 6(26) + 5
= 156 + 5
= 161 cm
Total length of string not used
= 320 - 161
= 159 cm
1 cm = 0.01 m
159 cm = 1.59 m
Answer(s): (a) (6f + 5) cm; (b) 1.59 m