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Geometry Vocabulary
Contributed by: Mac Dermott
(Original author: Heath)
  • 1. A line segment from the center of the circle to any point on the circle.
A) opposite angle
B) I don't know
C) acute triangle
D) radius
  • 2. A line segment that passes through the circle with endpoints on the circle.
A) adjacent angle
B) congruent
C) diameter
  • 3. Angles that are opposite each other when two lines intersect.
A) radius
B) opposite angle (also called vertical angle)
C) straight angle
  • 4. Angles that are next to each other. They have a common vertex and share a side.
A) adjacent angle
B) I don't know
C) diameter
D) right angle
  • 5. An angle that measures exactly 180 degrees.
A) straight angle
B) radius
C) opposite angle
  • 6. A 90 degree angle.
A) adjacent angle
B) diameter
C) right angle
  • 7. An angle that measures less than 90 degrees.
A) straight angle
B) equilateral triangle
C) acute angle
  • 8. An angle that measures more that 90 degrees but less than 180 degrees.
A) obtuse angle
B) right triangle
C) isosceles triangle
  • 9. A triangle with all three sides equal in length.
A) scalene triangle
B) equilateral triangle (also called equiangular triangle)
C) acute angle
  • 10. A triangle with at least two sides equal in length.
A) acute triangle
B) isosceles triangle
C) obtuse angle
  • 11. A triangle with sides of three different lengths.
A) scalene triangle
B) equilateral triangle
C) congruent
  • 12. Having the same size and shape.
A) isosceles triangle
B) congruent
C) obtuse angle
  • 13. A triangle that has a right angle.
A) right triangle
B) acute angle
C) obtuse triangle
  • 14. A triangle that has an obtuse angle.
A) scalene triangle
B) obtuse triangle
C) right triangle
  • 15. A triangle that has all acute angles.
A) obtuse triangle
B) right angle
C) acute triangle
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