Polygon
A closed plane figure made up of line segments
Quadrilateral
A polygon with four sides
Trapezoid
A quadrilateral with exactly one pair of parallel sides
Parallelogram
A quadrilateral with both pairs of opposite sides parallel.
Square
A parallelogram with four congruent sides and four right angles.
Rectangle
a parallelogram with 4 right anglesA quadrilateral with four right angles
Rhombus
A parallelogram with four congruent sidesa parallelogram with 4 congruent sides
Acute Triangle
A triangle with 3 acute angles
Obtuse Triangle
a triangle with one obtuse angle, or greater than 90 degrees but less than 180 degrees.
Right Triangle
a triangle with one right angleA triangle whose largest angle measures 90°.
Isosceles triangle
a triangle with at least two congruent sides
Equilateral Triangle
A triangle with three congruent sides
Scalene Triangle
a triangle with no congruent sides
Cylinder
A solid shape with one curved surface and two congruent circular bases.
Cone
A three dimensional figure with one vertex and one circular base
Pyramid
A polyhedron with a polygon base and triangular sides that all meet at a common vertex
Sphere
ball, sphere, or round
Prism
A polyhedron with two parallel congruent faces called bases
Tetrahedron
A polyhedron with four faces,a geometric solid having four sides that are equilateral triangles
Ratio
A comparison of two quantities by division
Proportion
An equation stating that two ratios are equalAn equation that states that two ratios are equivalent
Congruent
Having the same size and shape
Similar
Comparable,almost the same
Area
The number of square units required to cover a surface.
Perimeter
The distance around a polygon.the distance around a shape
Circumference
The distance around a circle
Radius
The distance from the center of a circle to any point on the circle
Diameter
A straight line passing from side to side through the center of a circle or sphere.
Area of a Circle
A=πr²
Circumference of Circle
C=2πr or C= pi x d