PSLE The perimeter of figure CDEFG is (8
h + 22) cm. The perimeter of square CDEF is 20 cm.
- Find the perimeter of triangle CFG in terms of h.
- The perimeter of figure CDEFG is 86 cm. What is the value of h? Give your answer in cm.
(a)
Length of the square
= 20 ÷ 4
= 5 cm
Total lengths of CD, DE and EF
= 3 x 5
= 15 cm
Perimeter of triangle CFG
= 8
h + 22 - 5 - 5
= (8
h + 12) cm
(b)
8
h + 22 = 86
8
h = 86 - 22
8
h = 64
h = 64 ÷ 8 = 8
Value of
h = 8 cm
Answer(s): (a) (8
h + 12) cm; (b) 8 cm