PSLE The perimeter of figure CDEFG is (6
q + 18) cm. The perimeter of square CDEF is 12 cm.
- Find the perimeter of triangle CFG in terms of q.
- The perimeter of figure CDEFG is 60 cm. What is the value of q? Give your answer in cm.
(a)
Length of the square
= 12 ÷ 4
= 3 cm
Total lengths of CD, DE and EF
= 3 x 3
= 9 cm
Perimeter of triangle CFG
= 6
q + 18 - 3 - 3
= (6
q + 12) cm
(b)
6
q + 18 = 60
6
q = 60 - 18
6
q = 42
q = 42 ÷ 6 = 7
Value of
q = 7 cm
Answer(s): (a) (6
q + 12) cm; (b) 7 cm