Geometry Vocabulary Words!

Isoceles

A triangle with 2 equal sides and 2 equal angles

Obtuse

An angle that measure more than 90 degrees and less than 180 degrees

Perpendicular

Lines that intersect to form right angles

Parallel

Lines or segments that never intersect because ethe distance between them is constant.

Diagonal

A straight line segment that connects two corners of a shape that are not right next to each other

Vertical

Angles formed from intersecting lines, they are across from each other, they only share a vertex, they are congruent.

Rigid

A shape or figure that keeps its exact size and shape even when it is moved , turned, or flipped around

Scalene

A triangle with no equal sides

Reflexive

Any geometric figure, line segment, or angle is always equal or congruent to itself.

Example: AB ≈ AB or triangleABC ≈triangleABC

Dilation

Changes the size of a shape (making it bigger or smaller) without changing it's shape or angles

Theorem

A rule or statement that has proven to be true using logical steps, definitions, and other already proven facts

Pythagorean

In any right triangle, the area of the square built on the longest side equals the sum of the areas of the squares on the other two shorter sides

Parallelogram

A flat four-sided shape (a quadrilateral) where both pairs of opposite sides are parallel

Quadrilateral

A polygon that has exactly four sides, four corners, and four angles

Similar

Almost the same, but not exact