PSLE The perimeter of figure RSTUV is (10
d + 15) cm. The perimeter of square RSTU is 8 cm.
- Find the perimeter of triangle RUV in terms of d.
- The perimeter of figure RSTUV is 85 cm. What is the value of d? Give your answer in cm.
(a)
Length of the square
= 8 ÷ 4
= 2 cm
Total lengths of RS, ST and TU
= 3 x 2
= 6 cm
Perimeter of triangle RUV
= 10
d + 15 - 2 - 2
= (10
d + 11) cm
(b)
10
d + 15 = 85
10
d = 85 - 15
10
d = 70
d = 70 ÷ 10 = 7
Value of
d = 7 cm
Answer(s): (a) (10
d + 11) cm; (b) 7 cm