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# 5th Grade EDM Unit 3

### Geometry Explorations

TermDefinition
acute angle an angle with a measure less than 90 degrees
obtuse angle an angle with a measure between 90 and 180 degrees
reflex angle an angle with a measure between 180 and 360 degrees
right angle an angle with a measure of 90 degrees
adjacent angles two angles with a common side and vertex that do not overlap
arc a part of a circle between and including two endpoints on the circle; named by its endpoints
pentagon a 5-sided polygon
regular polygon a polygon in which all sides are the same length and all angles have the same measure
center of a circle the point in the plane of a circle equally distant from all points on the circle
radius of a circle a line segment from the center of a circle or sphere to any point on the circle or sphere; half of the diameter
perimeter the distance around the boundary of a 2-dimensional figure
circumference the perimeter of a cirlce
diameter a line segment that passes through the center of a circle or sphere and has endpoints on the circle or sphere
equilateral triangle a triangle with all three sides equal in length; all angles measure 60 degrees
isosceles triangle a triangle with at least two sides equal in length; angles opposite the congruent sides are congruent to each other
scalene triangle a triangle with sides of three different lengths and three different angles
regular tessellation a tessellation of one regular polygon
tessellation a pattern of shapes that covers a surface completely without overlaps or gaps
vertical angles the angles made by intersecting lines that do not share a common side; also called opposite angles; angles have equal measures
straight angle an angle with a measurement of 180 degrees
congruent figures having the same size and shape
Created by: SarahMueller