Honors Geometry Unit 5

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14 Terms

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Right Triangle

ONE angle = 90°

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Acute triangle

All angles < 90°

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Obtuse Triangle

one angle > 90°

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Scalene triangle

No side lengths are equal

5
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isosceles triangle

2 equal sides

6
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Equilateral triangle

all side lengths are equal

7
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Equiangular triangle

all angles are equal

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Isosceles Triangle Theorem

if two sides of a triangle are congruent, then the angles opposite those sides are congruent.

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Equilateral Triangles

a triangle is equilateral if and only if it is equiangular

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SSS

Side-SIde-Side, 3 congruent sides

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SAS

2 Congruent sides and a “Sandwiched” angle

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ASA

2 congruent angles and a “sandwiched” side

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AAS

2 congruent angles and a “unsandwhiced” side

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HL

Only used with right triangles, Hypotenuse and leg (both marked).