PSLEEthan had 3.4 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 a.
- If a = 16, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= a + a + a + (2a - 5) + (a + 15)
= a + a + a + 2a + a - 5 + 15
= (6 a + 10) cm
(b)
1 m = 100 cm
3.4 m = 340 cm
Total length of thread used if a = 16
= 6 a + 10
= 6(16) + 10
= 96 + 10
= 106 cm
Total length of thread not used
= 340 - 106
= 234 cm
1 cm = 0.01 m
234 cm = 2.34 m
Answer(s): (a) (6a + 10) cm; (b) 2.34 m