PSLE The perimeter of figure VWXYZ is (7
m + 20) cm. The perimeter of square VWXY is 12 cm.
- Find the perimeter of triangle VYZ in terms of m.
- The perimeter of figure VWXYZ is 76 cm. What is the value of m? Give your answer in cm.
(a)
Length of the square
= 12 ÷ 4
= 3 cm
Total lengths of VW, WX and XY
= 3 x 3
= 9 cm
Perimeter of triangle VYZ
= 7
m + 20 - 3 - 3
= (7
m + 14) cm
(b)
7
m + 20 = 76
7
m = 76 - 20
7
m = 56
m = 56 ÷ 7 = 8
Value of
m = 8 cm
Answer(s): (a) (7
m + 14) cm; (b) 8 cm