Angle and Triangle Flash Cards You need 15 index cards for this!

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Angle and Triangle Flash Cards You need 15 index cards for this!

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Transcript of Angle and Triangle Flash Cards You need 15 index cards for this!

Page 1: Angle and Triangle Flash Cards You need 15 index cards for this!

Angle and Triangle Flash Cards

You need 15 index cards for this!

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Angle

A

B C

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Two rays with a common endpoint called a vertex.

Always name an angle with the vertex in the middle.

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Adjacent Angles

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Angles that share a vertex and a side.

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Congruent Angles

64° 64° Y X

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Angles with the same measure.

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Vertical Angles

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Angles formed by intersecting lines and are opposite each

other.

Vertical angles are always congruent!

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Acute Angles

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The measure of the angle is less than 90°.

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Obtuse Angles

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The measure of the angle is greater

than 90° and less than 180°.

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Right Angles

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The measure of the angle is 90°.

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Complementary Angles

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The sum of the two angles is 90°.

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Supplementary Angles

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The sum of the two angles is 180°.

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SCALENE TRIANGLE

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All three sides have different lengths:

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ISOSCELES TRIANGLE

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Has at least 2 congruent sides

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EQUILATERAL TRIANGLE

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All three sides are congruent

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ACUTE TRIANGLE

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All of the angles are acute

(less than 90°)

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OBTUSE TRIANGLE

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One obtuse angle

(greater than 90 less than 180)

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RIGHT TRIANGLE

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Has one right angle (90°)


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How do you find angle measurements in this triangle?

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Lesson 5-3 Inequalities in one Triangle. Vocabulary Theorem 5.8: Exterior Angle Inequality The measure of an exterior angle of a triangle is greater than.

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Geometry -- Chapter 5 Test Review 5.1 Angle …...3. Classify each triangle by angle measures and side lengths. 4. Given equilateral triangle FGH, 5. Find the perimeter of the triangle.

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