PSLE The perimeter of figure QRSTU is (4
c + 14) cm. The perimeter of square QRST is 24 cm.
- Find the perimeter of triangle QTU in terms of c.
- The perimeter of figure QRSTU is 50 cm. What is the value of c? Give your answer in cm.
(a)
Length of the square
= 24 ÷ 4
= 6 cm
Total lengths of QR, RS and ST
= 3 x 6
= 18 cm
Perimeter of triangle QTU
= 4
c + 14 - 6 - 6
= (4
c + 2) cm
(b)
4
c + 14 = 50
4
c = 50 - 14
4
c = 36
c = 36 ÷ 4 = 9
Value of
c = 9 cm
Answer(s): (a) (4
c + 2) cm; (b) 9 cm