- 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.
- Quadrilateral
- A straight line from the center to the circumference of a circle or sphere.
- Radius
- 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.
- Quadrilateral

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