ISOSCELES TRIANGLE

If two sides of a triangle are congruent (equal in length), then the angles opposite those sides are congruent (equal in measure)

GEOMETRY

SUM OF TWO ANGLES OF A TRIANGLE

If a side of a triangle is extended, the exterior angle formed is equal to the sum of the two opposite interior angles (also called remote interior angles)

GEOMETRY

RELATION BETWEEN INSCRIBE AND CENTRAL ANGLE

The measure of the central angle of a circle is twice the measure of an inscribed angle that subtends the same arC

GEOMETRY

SUM OF OPPOSITE ANGLES OF INSCRIBED QUADRILATERAL

The opposite angles of a quadrilateral inscribed in a circle are supplementary (their sum is exactly 180°)

GEOMETRY

Equation Puzzle

Solve algebraic puzzles by interacting with variables and seeing immediate visual feedback.

GEOMETRY