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In parallelogram PQRS, angle $P = (4 x)$ deg and angle $Q = (5 x)$ deg.
They are adjacent angles. Find angle R (in degrees).

Class 9Properties of a ParallelogramGeometry — Quadrilaterals

A80
B72
C88
D160

Step-by-Step Solution

Adjacent:

4 x + 5 x = 180, 9 x = 180, x = 20

. Angle

P = 80

deg; angle

R

= angle

P

(opposite) = 80°.

Answer: A) 80

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