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19 Cards in this Set
- Front
- Back
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This angle measures between 90° and 180° |
Obtuse Angle |
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This angle measures less than 90° |
Acute angle |
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Inside numbers on a protractor measure what |
Angles that open up to the right of the vertex < |
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Outside numbers on a protractor measure what |
Angles that open to the left of the vertex > |
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This angle measures exactly 180° |
Straight angle |
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This angle measures more than 180° but less than 360° |
Reflex angles |
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Angle bisector |
The line that cuts an angle into two equal parts |
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Sum of all angles of a triangle |
180 (60 each angle) |
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These lines never cross each other, they always stay the same distance apart. |
Parallel lines |
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A line that crosses two or more parallel lines is a |
Transversal line |
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These lines cross each other at right angles, often marked with one right angle symbol. |
Perpendicular lines |
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A pair of equal angles formed by two lines that cross and form a x pattern |
Opposite angles |
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Two angles that add up to 180° and form a straight angle |
Supplementary angles |
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Two angles that add up to 90° and form a right angle or L pattern |
Complementary angles |
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A pair of angles on the same side of a transverse line crossing parallel lines. These angles are equal and form a F pattern |
Corresponding angles |
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A pair of angles on the same side of a transverse and outside the parallel lines, they add up to 180° and form a C pattern. |
Same side exterior angles |
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A pair of angles on the same side of a transverse and inside parallel lines, these angles add to 180° and form a C pattern |
Same side interior angles |
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A pair of angles on opposite sides of a transverse and outside the parallel line, these angles are equal. |
Alternate exterior angles |
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A pair of angles on opposite sides of a transverse and inside the parallel lines, these angles are equal and form a Z pattern. |
Alternate interior angles |
