SAT geometry from KD

Angles that form a line

Add up to 180° (linear pair).

Vertical angles

Are congruent.

Bisect

To split something into two equal parts (angle or segment).

Perpendicular lines

Lines that form right angles (90°).

Regular polygon

A polygon with all equal sides and all equal angles.

Diagonal

A segment connecting two nonconsecutive vertices of a polygon.

Diagonals of a square / rhombus / kite

They are perpendicular to each other.

Sum of interior angles of a triangle

180°

Sum of interior angles of any polygon

180(n − 2) degrees, where n = number of sides.

Sum of exterior angles of any polygon

Always 360°.

Similar figures

Corresponding angles are congruent and corresponding sides are proportional.

Congruent figures

All corresponding parts are congruent.

Equilateral triangle

Has 3 congruent sides and 3 congruent angles (60° each).

Isosceles triangle

Has at least 2 congruent sides and at least 2 congruent angles.

Scalene triangle

Has no congruent sides and no congruent angles.

Opposite angles of a parallelogram

They are congruent.

Consecutive angles of a parallelogram

They are supplementary (add to 180°).

Degree ↔ Radian conversion

180° = π radians.