Mathematics
The perimeter of a parallelogram ABCD = 40 cm, AB = 3x cm, BC = 2x cm and CD = 2(y + 1) cm. Find the values of x and y.
Rectilinear Figures
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Answer
The perimeter of a parallelogram ABCD = 40 cm.
AB = 3x cm, BC = 2x cm and CD = 2(y + 1) cm.
In a parallelogram, opposite sides are equal:
AB = CD and BC = DA
The perimeter of a parallelogram is given by:
⇒ Perimeter = AB + BC + CD + DA
⇒ 40 = AB + BC + AB + BC
⇒ 40 = 3x + 2x + 3x + 2x
⇒ 40 = 10x
⇒ x = = 4 cm
Since CD = AB,
⇒ 2(y + 1) = 3x
⇒ 2y + 2 = 3 x 4
⇒ 2y + 2 = 12
⇒ 2y = 12 - 2
⇒ 2y = 10
⇒ y = = 5
Hence, the values are x = 4 cm and y = 5 cm.
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