PSLE The perimeter of figure GHJKL is (10
x + 15) cm. The perimeter of square GHJK is 24 cm.
- Find the perimeter of triangle GKL in terms of x.
- The perimeter of figure GHJKL is 85 cm. What is the value of x? Give your answer in cm.
(a)
Length of the square
= 24 ÷ 4
= 6 cm
Total lengths of GH, HJ and JK
= 3 x 6
= 18 cm
Perimeter of triangle GKL
= 10
x + 15 - 6 - 6
= (10
x + 3) cm
(b)
10
x + 15 = 85
10
x = 85 - 15
10
x = 70
x = 70 ÷ 10 = 7
Value of
x = 7 cm
Answer(s): (a) (10
x + 3) cm; (b) 7 cm