Geometry and TrigonometryEasy–MediumAngles around a point
Geometry and Trigonometry practice question
Three angles meet at a point and together fill the full turn around it. Two of the angles measure 120° and 130°. What is the measure, in degrees, of the third angle?
Answer: 110
The angles around a point add to 360°: 360 − 120 − 130 = 110.
Common wrong answers
- If you answered 70
- 70 is 180 − 110 or a similar slip; the third angle is 360 − 250 = 110.
- If you answered 250
- 250 is 120 + 130, the two known angles added — not the third one.
- If you answered -70
- −70 is 180 − 250, using a straight angle's 180. A full turn is 360.
More Geometry and Trigonometry questions
- Easy–Medium
A circle has a radius of 6. What is its area? (Use A = πr².) - Easy–Medium
A right triangle has legs of length 6 and 8. What is the length of the hypotenuse? - Easy–Medium
A circle has a radius of 5. What is its circumference? (Use C = 2πr.) - Easy–Medium
What is the midpoint of the segment joining the points (2, 3) and (8, 11)? - Easy–Medium
What is the measure, in degrees, of angle B? - Easy–Medium
What is the area, in square centimeters, of the trapezoid?
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