A triangle that contains only angles that are less than 90 degrees.
Acute Triangle
The amount of rotation needed to bring one line or plane into coincidence with another, generally measured in radians or degrees.
Angle
The number of square units required to cover a surface.
Area
1. An imaginary line through a body, about which it rotates.
Axis
A 3D point defining the geometric center of a solid.
Centroid
A round plane figure whose boundary consists of points equidistant from the center
Circle
1. A triangle located round a polygon such as a circle.
Circumscribe
A solid composed of two congruent circles in parallel planes, their interiors, and all the line segments parallel to the axis with endpoints on the two circles.
Cylinder
The measure of mass density is a measure of mass per volume.
Density
A straight line passing from side to side through the center of a circle or sphere.
Diameter
A shape generated by a point moving in a plane so that the sum of its distances from two other points (the foci) is constant and equal to the major axis
Ellipse
A curve formed at the interior intersection between two or more surfaces.
Fillet
To draw a figure within another so that their boundaries touch but do not intersect.
Inscribe
The amount of matter in an object or the quantity of the inertia of the object.
Mass
A triangle with one angle that is greater than 90 degrees.
Obtuse Triangle
A four-sided polygon with both pairs of opposite sides parallel.
Parallelogram
The numerical value of the ratio of the circumference of a circle to its diameter
Pi
Any plane figure bounded by straight lines.
Polygon
A solid geometric figure whose two ends are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.
Prism
A four-sided polygon.
A straight line from the center to the circumference of a circle or sphere.
A parallelogram with 90 degree angles. A square is also a rectangle.
Rectangle
A triangle that has a 90 degree angle.
Right Triangle
A regular polygon with four equal sides and four 90 degree angles.
Square
The squared dimensions of the exterior surface
Surface Area
A straight or curved line that intersects a circle or arc at one point only.
Tangent
A polygon with three sides.
Triangle
The amount of three-dimensional space occupied by an object or enclosed within a container.
Volume
A four-sided polygon.