PSLE The perimeter of figure PQRST is (9
e + 25) cm. The perimeter of square PQRS is 8 cm.
- Find the perimeter of triangle PST in terms of e.
- The perimeter of figure PQRST is 88 cm. What is the value of e? Give your answer in cm.
(a)
Length of the square
= 8 ÷ 4
= 2 cm
Total lengths of PQ, QR and RS
= 3 x 2
= 6 cm
Perimeter of triangle PST
= 9
e + 25 - 2 - 2
= (9
e + 21) cm
(b)
9
e + 25 = 88
9
e = 88 - 25
9
e = 63
e = 63 ÷ 9 = 7
Value of
e = 7 cm
Answer(s): (a) (9
e + 21) cm; (b) 7 cm