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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
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° X Y
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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
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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Parallel Lines
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Lines that are the same distance apart and never intersect (same slope)
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Perpendicular Lines
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Lines that intersect forming a perfect right angle
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Transversal
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A line that cuts across two or more other lines
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Corresponding Angles
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Angles that are in the same position
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Interior Angles
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Alternate Interior Angles are “across” from each other on the “inside”:
(A and D) (B and C)
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Exterior Angles
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An angle that occurs outside of two lines when they are crossed by a transversal
Alternate Exterior Angles are “across” from each other on the “outside”: (A and H) (B and G)
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