PSLE The perimeter of figure CDEFG is (4
v + 19) cm. The perimeter of square CDEF is 32 cm.
- Find the perimeter of triangle CFG in terms of v.
- The perimeter of figure CDEFG is 55 cm. What is the value of v? Give your answer in cm.
(a)
Length of the square
= 32 ÷ 4
= 8 cm
Total lengths of CD, DE and EF
= 3 x 8
= 24 cm
Perimeter of triangle CFG
= 4
v + 19 - 8 - 8
= (4
v + 3) cm
(b)
4
v + 19 = 55
4
v = 55 - 19
4
v = 36
v = 36 ÷ 4 = 9
Value of
v = 9 cm
Answer(s): (a) (4
v + 3) cm; (b) 9 cm