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Two rays with a common endpoint form an angle

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Two angles are supplementary if they add up to 180° - forming a straight line Two angles are complimentary if they add up to 90°

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In terior angles are in side of the shape Ex terior angles are formed when a line of a shape is ex tended

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1. Complimentary 2. Supplementary

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1. Two 2. Three 3. Four 4. Five

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1. 90° 2. 180° 3. 360°

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1. Right Angle An angle formed by perpendicular lines, line segments or rays with a measure of exactly 90° 2. Acute angle An angle that has a measure greater than 0° and less than 90° 3. Obtuse angle An angle whose measure is greater than 90° and less than 180°

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1. Right 2. Obtuse 3. Acute

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1. Right 2. Obtuse 3. Acute

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1. Right triangle A triangle with one right angle 2. Obtuse triangleA triangle that has one obtuse angle 3. Acute triangle A triangle in which all three angles are acute

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1. Right Triangle 2. Obtuse Triangle 3. Acute Triangle

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1. True 2. False

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1. Complimentary 2. Supplementary

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1. Scalene triangle A triangle with no congruent sides or angles 2. Isosceles triangle A triangle with two congruent sides and angles 3. Equilateral / Equiangular triangle A triangle with three congruent sides and angles

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1. Scalene 2. Isosceles 3. Equilateral

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1. Acute Isosceles 2. Obtuse Isosceles 3. Acute Scalene 4. Obtuse Scalene

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1. Right Scalene 2. Right Isosceles 3. Acute Isosceles 4. Obtuse Isosceles

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Triangles I © M. Tallman.

Triangles I © M. Tallman.

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