PSLE The perimeter of figure RSTUV is (6
b + 21) cm. The perimeter of square RSTU is 12 cm.
- Find the perimeter of triangle RUV in terms of b.
- The perimeter of figure RSTUV is 69 cm. What is the value of b? Give your answer in cm.
(a)
Length of the square
= 12 ÷ 4
= 3 cm
Total lengths of RS, ST and TU
= 3 x 3
= 9 cm
Perimeter of triangle RUV
= 6
b + 21 - 3 - 3
= (6
b + 15) cm
(b)
6
b + 21 = 69
6
b = 69 - 21
6
b = 48
b = 48 ÷ 6 = 8
Value of
b = 8 cm
Answer(s): (a) (6
b + 15) cm; (b) 8 cm