In parallelogram ABCD, Find the value of x, y, and z.  

F1 Abhishel Shraddha 07.12.2020 D2

  1. x = 130°, y = 50° and z = 65° 
  2. x = 120°, y = 60° and z = 60° 
  3. x = 100°, y = 60° and z = 50° 
  4. x = 140°, y = 55° and z = 70° 

Answer (Detailed Solution Below)

Option 1 : x = 130°, y = 50° and z = 65° 
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Detailed Solution

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Given:

ABCD is a parallelogram

Concept used:

The Sum of adjacent angles of the parallelogram is 180°.

Calculation:

F1 Abhishel Shraddha 07.12.2020 D2

In parallelogram ABCD

∠ADC + ∠DCB = 180°                            [Adjacent angles of parallelogram]

⇒ (z – 15)° + (2z)° = 180°

⇒ 3z = 195°

⇒ z = 65°

∠BAD + ∠ADC = 180°                             [Adjacent angles of parallelogram]

⇒ x° + (z – 15)° = 180°

⇒ x + (65 – 15) = 180°

⇒ x + 50° = 180°

⇒ x = 130°

∠DAB + ∠ABC = 180°                              [Adjacent angles of parallelogram]

⇒ x° + y° = 180°

⇒ 130° + y° = 180°

⇒ y = 50°

The value of x, y, and z are 130°, 50° and 65° respectively.

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