PSLE The perimeter of figure GHJKL is (10
w + 22) cm. The perimeter of square GHJK is 20 cm.
- Find the perimeter of triangle GKL in terms of w.
- The perimeter of figure GHJKL is 92 cm. What is the value of w? Give your answer in cm.
(a)
Length of the square
= 20 ÷ 4
= 5 cm
Total lengths of GH, HJ and JK
= 3 x 5
= 15 cm
Perimeter of triangle GKL
= 10
w + 22 - 5 - 5
= (10
w + 12) cm
(b)
10
w + 22 = 92
10
w = 92 - 22
10
w = 70
w = 70 ÷ 10 = 7
Value of
w = 7 cm
Answer(s): (a) (10
w + 12) cm; (b) 7 cm