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Mathematics

Three angles of a quadrilateral are 75°, 90° and 75°. The fourth angle is

  1. 90°

  2. 95°

  3. 105°

  4. 120°

Rectilinear Figures

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Answer

Sum of angles of quadrilateral = 360°

Let fourth angle be x then,

75° + 90° + 75° + x = 360°

x + 240° = 360°

x = 360° - 240°

x = 120°.

Hence, Option 4 is the correct option.

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