PSLE The perimeter of figure CDEFG is (7
v + 13) cm. The perimeter of square CDEF is 12 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
= 12 ÷ 4
= 3 cm
Total lengths of CD, DE and EF
= 3 x 3
= 9 cm
Perimeter of triangle CFG
= 7
v + 13 - 3 - 3
= (7
v + 7) cm
(b)
7
v + 13 = 55
7
v = 55 - 13
7
v = 42
v = 42 ÷ 7 = 6
Value of
v = 6 cm
Answer(s): (a) (7
v + 7) cm; (b) 6 cm