Pi * radius * radius

Circumference / diameter

2 * length + 2 * width

Angle greater than 90 degrees

Angle equal to 90 degrees

Angle less than 90 degrees

(1/3) * pi * radius * radius * height

Pi * radius * radius * height

Splits an angle into equal halves

Zero-dimensional object

Goes on forever in both directions

Lines with the same slope

Lines which meet at a right angle

2 * pi * radius

Length * width

6 * side * side

Triangle with all sides of equal length

Triangle with two sides of equal length

Triangle with no sides of equal length

Point shared by two rays or line segments

Longest side of a triangle

Length * width * height

Angles which add up to 90 degrees

Angles which add up to 180 degrees

Goes on forever in one direction

One-dimensional object of finite length

One of the theorems for proving congruent triangles

4 * pi * radius * radius

(4/3) * pi * radius * radius * radius

Polygon with four sides

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