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Cheat Sheet for Geometry Midterm

(only includes official postulates, theorems, corollaries and formulas)

points, lines, planes, intersections,

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Through any two points there is exactly one line.

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Through any three noncollinear points there is exactly one plane containing them.

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If two planes intersect, then they intersect in exactly one line.

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If two lines intersect, then they intersect in exactly one point.

linear pairs, supplements,

complements, vertical angles, right angles

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If two angles form a linear pair, then they are supplementary.

The sum of the measures of the angles of a linear pair is 180.

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If two angles are supplementary to the same angle or to two congruent angles, then the two

angles are congruent.

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If two angles are complementary to the same angle of to two congruent angles, then the two

angles are congruent.

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All right angles are congruent.

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Vertical angles are congruent.

parallel lines, angles formed by parallel lines and transversals,

perpendicular lines

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If two parallel lines are cut by a transversal, then corresponding angles are congruent.

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If two parallel lines are cut by a transversal, then alternate interior angles are congruent.

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If two parallel lines are cut by a transversal, then alternate exterior angles are congruent.

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If two parallel lines are cut by a transversal, then same side interior angles are

supplementary.

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If two lines are cut by a transversal so that corresponding angles are congruent, then the

lines are parallel.

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If two lines are cut by a transversal so that alternate interior angles are congruent, then the

lines are parallel.

(over)

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Parent category: Education