Geometry and Trigonometry Vocabulary

Flashcards covering fundamental geometry definitions and trigonometric ratios from the lecture notes.

Inscribed Angle

Angle whose vertex is on a circle and whose sides contain chords of the circle.

Central Angle

Angle whose vertex is the center of the circle.

Diameter

Distance across a circle, through its center.

Proportion

An equation with two equal ratios.

Regular Polygon

Polygon with congruent sides and angles.

Kite

Quadrilateral with 2 pairs of consecutive sides congruent and opposite sides not congruent.

Scale Factor

Ratio of the lengths of two corresponding sides in a similar figure.

Radius

Segment of a circle whose endpoints are the center of a circle and a point on the circle.

Congruent Figures

Two geometric figures that have exactly the same size & shape.

Similar Figures

Two geometric figures with congruent corresponding angles, and corresponding proportional sides.

Convex Polygon

A polygon that does not have any sides "caving in".

Parallel Lines

Lines in a plane that do not intersect.

Skew Lines

Lines not in the same plane that do not intersect.

Isosceles

A triangle (or trapezoid) with at least two congruent sides.

Equilateral Polygon

A polygon with all sides equal.

Postulate

A statement that can be assumed without proof.

Complementary Angles

Two angles whose measures add up to $90^{\circ}$.

Sine

A trig ratio that is opposite divided by hypotenuse.

Major Arc

Part of a circle that measures between $180^{\circ}$ and $360^{\circ}$.

Linear Pair

Two adjacent angles whose measures add up to $180^{\circ}$.

Cosine

A trig ratio that is adjacent divided by hypotenuse.

Rectangle

A parallelogram with four congruent angles.