Unit 4: Congruent Triangles TEST REVIEW

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20 Terms

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Equilateral Triangle

A triangle with three congruent sides

<p>A triangle with three congruent sides</p>
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Isosceles Triangle

A triangle with only two congruent sides

<p>A triangle with only two congruent sides</p>
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Scalene Triangle

A triangle with no congruent sides

<p>A triangle with no congruent sides</p>
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Acute Triangle

A triangle whose angles are all acute. Angle measures are less than 90 degrees.

<p>A triangle whose angles are all acute. Angle measures are less than 90 degrees.</p>
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Obtuse Triangle

A triangle with an obtuse angle. One angle measure is more than 90 degrees.

<p>A triangle with an obtuse angle. One angle measure is more than 90 degrees.</p>
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Right Triangle

A triangle with a right angle.

<p>A triangle with a right angle.</p>
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Equiangular Triangle

A triangle whose angles are all congruent.

<p>A triangle whose angles are all congruent.</p>
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Hypotenuse

The side across from the right angle in a right triangle.

<p>The side across from the right angle in a right triangle.</p>
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Base of an Isosceles Triangle

The side of an isosceles triangle that is not congruent to the other two sides.

<p>The side of an isosceles triangle that is not congruent to the other two sides.</p>
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Triangle Sum Theorem

The sum of the angles in a triangle is 180 degrees

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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 nonadjacent (far away) interior angles

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Angle-Side-Angle (ASA)

If two angles and the side between the two angles in a triangle are congruent, then the two angles and the side in the middle of another triangle, make the two triangles congruent

<p>If two angles and the side between the two angles in a triangle are congruent, then the two angles and the side in the middle of another triangle, make the two triangles congruent</p>
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Angle-Angle-Side (AAS)

If two angles and the side adjacent to the second angle of a triangle are congruent then, the two angles and the side adjacent to the second angle, make the two triangles congruent.

<p>If two angles and the side adjacent to the second angle of a triangle are congruent then, the two angles and the side adjacent to the second angle, make the two triangles congruent.</p>
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CPCTC

Two triangles are congruent if Corresponding Parts of Congruent Triangles are Congruent.

<p>Two triangles are congruent if Corresponding Parts of Congruent Triangles are Congruent.</p>
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Base Angle Theorem

If two sides of a triangle are congruent, then the angles opposite them are congruent.

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Hypotenuse Leg Congruence Theorem (HL)

If the hypotenuse and leg of a right triangle are congruent to the hypotenuse and leg of another right triangle, then the triangles are congruent.

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Reflexive Property

An angle or a segment that is congruent to itself.

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Side-Side-Side (SSS)

If three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent.

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Side-Angle-Side (SAS)

If two sides and the angle between the two sides of one triangle are congruent, then the two sides and the angle between of another triangle, make the triangles congruent.

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Perimeter of a Triangle

Adding all the sides.