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Rohan was told two angles $x$ and $x + 40$ ° form a linear pair. He wrote $x + (x + 40) = 90$ . What is the correct value of $x$ ?

Class 8Equations in GeometryLinear Equations

A25°
B140°
C70°
D50°

Step-by-Step Solution

A linear pair adds to 180°, not 90°:

2 x + 40 = 180

, so

x = 70°

. Rohan's 25° comes from using 90°.

Answer: C) 70°

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