PSLE The perimeter of figure QRSTU is (5
b + 19) cm. The perimeter of square QRST is 8 cm.
- Find the perimeter of triangle QTU in terms of b.
- The perimeter of figure QRSTU is 44 cm. What is the value of b? 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
= 5
b + 19 - 2 - 2
= (5
b + 15) cm
(b)
5
b + 19 = 44
5
b = 44 - 19
5
b = 25
b = 25 ÷ 5 = 5
Value of
b = 5 cm
Answer(s): (a) (5
b + 15) cm; (b) 5 cm