PSLEMark had 3.1 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 c.
- If c = 10, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= c + c + c + (3c - 3) + (c + 14)
= c + c + c + 3c + c - 3 + 14
= (7 c + 11) cm
(b)
1 m = 100 cm
3.1 m = 310 cm
Total length of thread used if c = 10
= 7 c + 11
= 7(10) + 11
= 70 + 11
= 81 cm
Total length of thread not used
= 310 - 81
= 229 cm
1 cm = 0.01 m
229 cm = 2.29 m
Answer(s): (a) (7c + 11) cm; (b) 2.29 m