Geometry Exam Review Flashcards

Flashcards covering key concepts from Unit 5 through Unit 9, focusing on triangle proofs, polygons, circles, solids, and transformations.

SSS, SAS, ASA, AAS, HL

Postulates to prove triangle congruency.

Included Angle

An angle between two given sides of a triangle.

(n - 2) × 180°

The sum of interior angles of a polygon with n sides.

½ × apothem × perimeter

Area of a regular polygon.

Area of a Circle

πr²

Arc Length Formula

(θ/360) × 2πr

Probability of a point in a shaded area

Shaded Area / Total Area

Central Angle vs. Arc

They are equal.

Inscribed Angle

½ the intercepted arc.

Power of a Point Theorem for chords

AE × EB = CE × ED

Tangents from the same point

They are congruent.

Surface Area of a Sphere

4πr²

Volume of a Cylinder

πr²h

Volume of a Cone

(1/3)πr²h

Translation

Using a vector ⟨x, y⟩

Dilation

Multiply each coordinate from the center by scale factor k.

Reflection

Flip it across a line, maintaining equal distances.

90° Counterclockwise Rotation

(x, y) becomes (−y, x)