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Lessons 4-3 / 4-8 Vocabulary

Name: ___________________________________
Date: ____________________ Block: __________
Across
(p. 286) A triangle is equilateral if and _____ if it is equiangular.
(p. 264) It is possible to prove two triangles congruent using _____ points.
(p. 277) You can use congruent triangles to measure _________ that are difficult to measure directly.
(p. 275) An included ____ is the ____ located between two consecutive angles of a polygon.
(p. 257 If two angles of one triangle are congruent to two angles of a second triangle, then the _____ angles of the triangle are congruent.
(p. 275) If two angles and the included side of one triangle are congruent to two angles and the included side of _______ triangle, then the triangles are congruent.
(p. 255) If two geometric figures have exactly the same shape and size, they are _________.
(p. 255) Two polygons are congruent if and only if their _____________ parts are congruent.
(p. 266) The angle formed by two adjacent sides of a polygon is called a(n) ________ angle.
(p. 266) The measures of two sides and a ___________ angle are not sufficient to prove two triangles congruent.
(p. 266) If two sides and the included angle of one triangle are congruent to two sides and the included angle of a(n) ______ triangle, then the triangles are congruent.
(p. 257) When two triangles share a common side, use the ________ Property of Congruence to establish the common side is congruent to itself.
(p. 303) The first step in a coordinate proof is _______ the figure on the coordinate plane.
(p. 285) _________ of Isosceles Triangles Theorem: If two angles of a triangle are congruent, then the sides opposite those angles are congruent.
(p. 265) When you are solving problems using the coordinate plane, remember to use tools like the Distance, ________, and Slope Formulas to check your solutions.
Down
(p. 285) The two angles ______ by the base and the congruent sides are called the base angles.
(p. 276) If ___ angles and the nonincluded side of one triangle are congruent to the corresponding ___ angles and side of a second triangle, then the two triangles are congruent.
(p. 285) The side of the triangle opposite the vertex angle is called the ____.
(p. 287) You can use the properties of equilateral triangles and _______ to find missing values.
(p. 304) The ____________ of the x- and y-axes form a right angle, so it is a convenient place to locate the right angle of a figure such as a right triangle.
(p. 286) ____ angle of an equilateral triangle measures 60.
(p. 258) Like congruence of segments and angles, congruence of triangles is reflexive, _________, and transitive.
(p. 285) The angle with sides that are the legs is called the ______ angle.
(p. 264) If _____ sides of one triangle are congruent to _____ sides of a second triangle, then the triangles are congruent.
(p. 255) In two congruent _________, all of the parts of one polygon are congruent to the corresponding parts or matching parts of the polygon.
(p. 255) Valid congruence statements for congruent polygons list corresponding ________ in the same order.
(p. 303) __________ proofs use figures in the coordinate plane and algebra to prove geometric concepts.
(p. 268) When triangles _______, it can be helpful to draw each triangle separately and label the congruent parts.
(p. 277) Congruence of ___ three corresponding angles is not sufficient, however, to prove two triangles congruent.
(p. 285) The two congruent sides are called the ____ of an isosceles triangle.
(p. 285) If two sides of a triangle are congruent, then the angles _______ those sides are congruent.