• If a transversal intersects two parallel lines, then corresponding angles are congruent.

CORRSEPONDING ANGLES POSTULATE

• All right angles are congruent.

THEOREM 2-4

THEOREM 10-11

• (Area of a circle)• The are of a circle is

the product of π and the square of the radius.

• A=πr^2

r

TRIANGLE• Three sided figure

whose angles add to be 180.

ISOSCELES TRAPEZOID

• Quadrilateral with one pair of parallel sides whose legs are congruent.

CIRCLE

• Set of all points in a plane that are a given distance, the radius, from a given point, the center.

CONE• 3D figure with a

circular base, a vertex not in the plane of the surface, and a curved lateral surface.

CYLINDER• 3D figure with two

congruent circular bases that lie in similar planes.

SUPPLEMENTARY ANGLES

• Pairs of angles that add to equal 180 degrees.

REFLECTION• When a shape is

flipped across a line and faces the opposite direction

ALTITUDE OF A TRIANGLE

• Perpendicular segment from a vertex to the line containing the side opposite that vertex.

TRANSLATION• Transformation

that moves points the same distance and in the same direction.

CENTROID OF A TRIANGLE

• The point of intersection of the medians of the triangle.

OBTUSE ANGLE• Angle whose

measure is more than 90 degrees and less than 180 degrees.

RADIUS• Any segment with

one endpoint on the circle and the other endpoint at the center of the circle.

SKEW LINES• Lines that do not

lie on the same plane and will never intersect.

INDIRECT MEASUREMENT

• Way of measuring things that are difficult to measure directly by measuring the distances shown and using proportions of similar figures you can find measurements.

VERTICAL ANGLES• Two angles

whose sides form opposite rays. Vertical angles congruent.

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