PSLEFlynn had 3.6 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 z.
- If z = 16, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= z + z + z + (2z - 6) + (z + 18)
= z + z + z + 2z + z - 6 + 18
= (6 z + 12) cm
(b)
1 m = 100 cm
3.6 m = 360 cm
Total length of string used if z = 16
= 6 z + 12
= 6(16) + 12
= 96 + 12
= 108 cm
Total length of string not used
= 360 - 108
= 252 cm
1 cm = 0.01 m
252 cm = 2.52 m
Answer(s): (a) (6z + 12) cm; (b) 2.52 m