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1
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A triangle that has one angle with a measure of 90.
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2
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A pair of nonadjacent angles formed by two intersecting lines.
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3
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Angles that have equal measures.
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4
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Lines that lie in the same plane (coplanar) and that never intersect.
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5
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A line that intersects two or more lines in different points.S
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6
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Two adjacent angles whose exterior sides form a straight line.
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7
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If a=b, then either a or b may be substituted for the other in an equation.
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9
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An angle with a measure that is less than 90.
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10
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A polygon that has three sides.
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18
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An angle with a measure of more than 90 but less than 180.
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19
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An angle with a measure of 90.
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