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Geometry vocabulary

Terms in this set (27)

polygon
A closed figure made up of at least 3 line segments that do not cross, such as a triangle, a quadrilateral, a pentagon, etc.
vertex
A point where two or more straight lines meet.
isosceles triangle
3-sided polygon. 2 congruent sides.
congruent
Having the same size and shape
scalene triangle
A triangle with no congruent sides
equilateral triangle
A triangle with three congruent sides
area of a rectangle
length x width (lw)
perimeter of a polygon
sum of the lengths of the sides
rectangular prism
A solid shape that has: 6 faces (4 rectangles & 2 squares), 8 vertices (corners), and 12 equal edges.
volume of rectangular prism
length x width x depth
midpoint
A point that divides a segment into two congruent segments
line
A straight path that extends without end in opposite directions
reflection
A transformation that "flips" a figure over a mirror or reflection line.
rotation
A transformation in which a figure is turned around a point
radius
A straight line from the center to the circumference of a circle or sphere.
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