Geometry and TrigonometryEasyFourth angle of a quadrilateral
Geometry and Trigonometry practice question
Three of the interior angles of a quadrilateral measure 80°, 95° and 110°. What is the measure, in degrees, of the fourth angle?
Answer: 75
A quadrilateral's interior angles add to 360°: 360 − 80 − 95 − 110 = 75.
Common wrong answers
- If you answered 95
- 95 is one of the given angles.
- If you answered 285
- 285 is the sum of the three known angles, not the fourth.
- If you answered -105
- −105 is 180 − 285, using a triangle's total of 180. A quadrilateral's angles add to 360.
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