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Lessons 4-1 / 4-2 Vocabulary

Name: ___________________________________
Date: _____________________ Block: _________
Across
(p. 238) at least 2 congruent sides
(p. 237) All triangles have at least ___ acute angles, but the third angle is used to classify the triangle.
(p. 238) an angle with a degree measure greater than 90
(p. 238) an angle with a degree measure of 90
(p. 249) A(n) _________ is a theorem with a proof that follows as a direct result of another theorem.
(p. 237) All triangles have at least two acute angles, but the _____ angle is used to classify the triangle.
(p. 249) The acute angles of a right triangle are _____________.
(p. 238) To indicate that sides are congruent, an equal number of ____ marks is drawn on the corresponding sides.
(p. 237) 3 congruent acute angles
(p. 237) Triangles can be __________ in two ways--by their angles or by their sides.
(p. 246) The ___ of the measures of the angles of a triangle is 180.
(p. 238) an angle with a degree measure less than 90
(p. 248) The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote ________ angles.
(p. 246) The Triangle Angle-Sum _______ gives the relationship among the interior angle measures of any triangle.
(p. 237) A(n) ________ is a three-sided polygon.
Down
(p. 237) When classifying triangles, be as ________ as possible.
(p. 246) As with any statement in a proof, you must _______ any properties of an auxiliary line that you have drawn.
(p. 248) A flow proof is sometimes called a(n) _________ proof.
(p. 247) The Triangle Angle-Sum Theorem can be used to determine the measure of the third angle of a triangle when the other two angle measures are _____.
(p. 248) A(n) ____ proof uses statements written in boxes and arrows to show the logical progression of an argument.
(p. 249) There can be at most ___ right or obtuse angle in a triangle.
(p. 246) A(n) _________ line is an extra line or segment drawn in a figure to help analyze geometric relationships.
(p. 248) Flow proofs can be written vertically or ____________.
(p. 238) 3 congruent sides
(p. 238) no congruent sides
(p. 248) In addition to its three interior angles, a triangle can have ________ angles formed by one side of the triangle and the extension of an adjacent side.
(p. 237) An equiangular triangle is a _______ kind of acute triangle.
(p. 248) Each exterior angle of a triangle has two ______ interior angles that are not adjacent to the exterior angle.
(p. 248) The ______ justifying each statement is written below the box.
(p. 249) When you are solving for the measure of one or more angles of a triangle, always _____ to make sure that the sum of the angle measures is 180.
(p. 238) Triangles can also be classified according to the number of congruent _____ they have.