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Math 5 Unit 3

Geometry

QuestionAnswer
radius A line segment from the center of a circle to any point on the circle (half of the diameter)
reflex angle An angle with a measure between 180 degrees and 360 degrees.
acute angle An angle that measures less than 90 degrees.
perpendicular line segments that form right angles are perpendicular to each other.
diameter A line segment that passes through the center of a circle and has endpoints on the circle (twice the length of the radius)
isosceles triangle A triangle with at least two sides that are the same length and ast least two angles that are the same measure.
obtuse angle An angle that measures more than 90 degrees, but less than 180 degrees.
vertical angles The angles that do not share a common side when two line intersect. Vertical angles have equal measures. Also called opposite angles.
polygons A closed shape made up of 3 or more line segments that meet at their endpoints.
equilateral triangle A triangle with 3 equal sides and 3 equal angles.
right angle An angle that measures exactly 90 degrees.
adjacent angles Two angles with a common side and vertex that do not otherwise overlap.
tessellations Shapes that fit together without any gapping or overlapping
scalene triangle A tiangle that has no equal sides or angles.
staight angle An angle that measures exactly 180 degrees.
vertex The point at which the line segments of an angle meet.
congruent Having the same size and shape. They will fit "on top of" the other figure with a combination of slides, slips, and turns.
parallel Lines that never intersect and are equidistant at all points.
right triangle A traingle that has a right angle.
Created by: wwsmath5
 

 



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