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1/2 b*h

Area of a triangle

2 pi* r

Circumference of a circle

translation

It is a transformation that moves points the distance and in the same direction.

reflection

It is a transformation that flips a figure over a line of reflection.

rotation

It is a transformation that turns a figure about a fixed point.

Central Angle

an angle whose vertex is the center of the circle

corresponding angles

Angles that have the same relative positions in geometric figures.

alternate interior angles

Angles that lie within a pair of parallel lines and on opposite sides of a transversal; congruent

Circle

in a plane, the set of all points equidistant from a given point

Center

Each regular polygon has a center because it can be inscribed in a circle.

radius

From center to a point on the circle.

Chord

is a segment whose endpoints lie on the circle

diameter

A straight line passing through the centre of a circle to touch both sides of the circumference.

cylinder

A solid shape with one curved surface and two congruent circular bases.

cone

A solid shape with a circular base and a curved surface that come to a point (vertex).

sphere

A solid shape that is perfectly round like a ball. No faces, edges, or vertices.