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The following figure shows a parallelogram ABCD.

Use the given informations to find the values of x, y and z.

The following figure shows a parallelogram ABCD. Chapterwise Revision (Stage 1), Concise Mathematics Solutions ICSE Class 9.

Rectilinear Figures

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Answer

Opposite sides of a parallelogram are equal.

⇒ AB = CD

⇒ (3x - 1) = (2x + 2)

⇒ 3x - 2x = 2 + 1

⇒ x = 3 cm

Sum of two consecutive angles of a parallelogram is 180°.

⇒ ∠A + ∠B = 180°

⇒ (50° + z) + 102° = 180°

⇒ 50° + z + 102° = 180°

⇒ 152° + z = 180°

⇒ z = 180° - 152°

⇒ z = 28°

AB ∥ CD and AC is transversal line,

⇒ ∠BAC = ∠ACD

⇒ ∠BAC = ∠ACD = 28°

Now, ∠ACD and ∠y forms a linear pair.

⇒ ∠ACD + ∠y = 180°

⇒ 28° + ∠y = 180°

⇒ ∠y = 180° - 28°

⇒ ∠y = 152°

Hence, the value of x = 3 cm, y = 152° and z = 28°.

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