PSLERiordan 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 c.
- If c = 30, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= c + c + c + (3c - 5) + (c + 12)
= c + c + c + 3c + c - 5 + 12
= (7 c + 7) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of string used if c = 30
= 7 c + 7
= 7(30) + 7
= 210 + 7
= 217 cm
Total length of string not used
= 320 - 217
= 103 cm
1 cm = 0.01 m
103 cm = 1.03 m
Answer(s): (a) (7c + 7) cm; (b) 1.03 m