Cheat Sheet For Geometry Page 2
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If two lines are cut by a transversal so that alternate exterior angles are congruent, then the
lines are parallel.
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If two lines are cut by a transversal so that same side interior angles are supplementary,
then the lines are parallel.
angles of triangles,
exterior angles, remote interior angles
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The sum of the measures of the interior angles of a triangle is 180.
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The acute angles of a right triangle are complementary.
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The measure of each angle of an equilateral triangle is 60.
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The measure of one exterior angle of a triangle is equal to the sum of the measures of its
remote interior angles.
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If two angles of one triangle are congruent to two angles of another triangle, then the third
angles are congruent.
congruent triangles, isosceles triangles
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SAS Postulate
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ASA Postulate
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SSS Postulate
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AAS Theorem
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HL Theorem
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CPCTC
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If two sides of a triangle are congruent, then the angles opposite these sides are congruent.
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If two angles of a triangle are congruent, then the sides opposite these angles are
congruent.
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If three sides of a triangle are congruent, then the three angles are also congruent.
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If three angles of a triangle are congruent, then the three sides are also congruent.
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