Basic Geometry Terms
a shape is ___ if ti has inward curves or "dents"
Concave
a closed two dimensional shape with 3 straight sides
triangle
has four equal sides and four equal angels
square
a quadrilateral whose four sides can be grouped into 2 pairs of equal length sides that are adjacent to each other
Kite
a 6 sided polygon with 6 vertices and 6 angles
Hexagon
a shape is ___ if it all its edges "point outward"
Convex
Equilateral Triangle
quadrilateral with 4 right angles
Rectangle
a triangle that has two sides of equal length
Isosceles Triangle
a 9 sided polygon
nonagon
exactly equal in size & shape: sides have same length, angles same measure
Congruent
triangle in which one angle is a right angle
Right Triangle
a flat shape with opposite sides parallel & equal in length
Parallelogram
a triangle with 3 unequal sides
Scalene Triangle
12 sided polygon
Dodecagon
a two dimensional plane shape with straight sides
Polygon
Triangle where one of the internal angles is greater than 90 degrees but less than 180 degrees
Obtuse Triangle
a flat shape with 4 straight sides that has a pair of opposite sides parallel
Trapezoid
a trapezoid with 2 non-parallel sides the same length
Isosceles Triangle
7 sided polygon
a closed, two dimensional shape with 4 straight sides
Quadrilateral
Triangle with three angles less than 90 degrees
Acute Triangle
Parallelogram with opposite acute angles, opposite equal obtuse angles and 4 equal sides
Rhombus
Pentagon
10 sided polygon
Decagon