Triangle Vocabulary
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Acute Triangle | A triangle where ALL angles are acute (less than 90 degrees)
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| Obtuse Triangle | A triangle where one angle is obtuse (greater than 90 degrees but less than 180 degrees)
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| Right Triangle | A triangle where one angle is right (EQUAL to 90 degrees)
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| Equilateral Triangle | A triangle where all sides are congruent
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| Scalene Triangle | A triangle where all three sides have different lengths
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| Isosceles Triangle | A triangle with two sides congruent
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| Base Angles | the two angles of an isosceles triangle formed by the base and one of the congruent sides (‘bottom angles’)
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| Vertex Angle | the angle of an isosceles triangle formed by the congruent sides (‘top angle’)
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| Isosceles Triangle Theorem | If two sides of a triangle are congruent, then the triangle is isosceles
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| Angle Sum Theorem (aka Triangle Theorem) | The sum of the measures of the interior angles of a triangle is 180 degrees
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| Exterior Angle | The angle formed outside of the triangle by extending one side of the triangle out of the triangle
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| Remote Interior Angles | The two interior angles of the triangle NOT ADJACENT (next to) the given exterior angle referenced
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| Exterior Angle Theorem | The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles
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| Flow Proof | A proof that organizes a series of statements in a logical order starting with given statements. Each statement following includes a reason verifying the statement
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| Corollary 4.1 | The acute angles of a right triangle are complementary (their sum is 90 degrees)
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| Congruent Triangles | Triangles that are the same size and shape
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| CPCTC | Two triangles are congruent if and only if (IFF) their corresponding parts are congruent – Corresponding Parts of Congruent Triangles are Congruent
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| Congruence Transformation | to slide, flip or turn a triangle and the size or shape doesn't change
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| Included Angle | The angle of a triangle BETWEEN the two given sides of the same triangle
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| Included Side | The side of a triangle BETWEEN the two given angles of the same triangle
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| Corollary 4.4 (Equilateral Triangle Angle Measures) | Each angle of an equilateral triangle measures 60 degrees
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
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Created by:
martha.kelley
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