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Grade8 Geometry

Geometry Terms

an exact location in space point
a straight path that extends without end in opposite directions line
a flat surface that extends forever plane
a part of a line between two endpoints segment
a part of a line that starts at one endpoint and extends forever ray
an angle that measures 90 degrees right angle
an angle that measures less than 90 degrees acute angle
an angle that measures greater than 90 degrees but less than 180 degrees obtuse angle
two angles whose measures add up to 90 degrees complementary angles
two angles whose measures add up to 180 degrees supplementary angles
having the same size and shape congruent
a pair of opposite congruent angles formed by intersecting lines vertical angles
lines in a plane that do not intersect parallel lines
lines that intersect to form right angles perpendicular lines
a line that intersects two or more lines transversal
the theorem that states that the measures of the angles in a triangle add up to 180 degrees. Triangle Sum Theorem
a triangle with all angles measuring less than 90 degrees acute triangle
a triangle with one right angle right triangle
a triangle with three congruent sides and three congruent angles equilateral triangle
a triangle with at least two congruent sides and two congruent angles isoceles triangle
a triangle with no congruent sides and no congruent angles scalene triangle
a closed plane figure formed by three or more segments polygon
a closed plane figure with sides and angles of equal measures regular polygon
a quadrilateral with exactly one pair of parallel sides trapezoid
a four sided polygon quadrilateral
a quadrilateral with four right angles rectangle
a quadrilateral with two pairs of parallel sides parallelogram
a quadrilateral with four congruent sides rhombus
a quadrilateral with four right angles and four congruent sides square
a five sided polygon pentagon
a six sided polygon hexagon
an eight sided polygon octogon
a quadrilateral with two adjacent sets of congruent sides kite
Created by: janepope