PSLE The perimeter of figure QRSTU is (8
y + 21) cm. The perimeter of square QRST is 8 cm.
- Find the perimeter of triangle QTU in terms of y.
- The perimeter of figure QRSTU is 93 cm. What is the value of y? Give your answer in cm.
(a)
Length of the square
= 8 ÷ 4
= 2 cm
Total lengths of QR, RS and ST
= 3 x 2
= 6 cm
Perimeter of triangle QTU
= 8
y + 21 - 2 - 2
= (8
y + 17) cm
(b)
8
y + 21 = 93
8
y = 93 - 21
8
y = 72
y = 72 ÷ 8 = 9
Value of
y = 9 cm
Answer(s): (a) (8
y + 17) cm; (b) 9 cm