Geometry and TrigonometryHardFifth angle of a pentagon
Geometry and Trigonometry practice question
The interior angles of a pentagon have a sum of 540°. Four of the interior angles of a certain pentagon each measure 100°. What is the measure, in degrees, of the fifth angle?
Answer: 140
540 − 400 = 140.
Common wrong answers
- If you answered 40
- 40 is 140 − 100.
- If you answered 100
- 100 assumes all five angles are equal.
- If you answered 108
- 108 is the angle of a regular pentagon.
More Geometry and Trigonometry questions
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