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5
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A line about which a curve or an object may rotate or revolve
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6
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The direction from left to right, or at a right angle to an upright line
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7
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Points or lines that all lie in the same plane
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8
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An angle formed on the outside of a polygon by extending one of its sides
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10
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Having all sides of equal length
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12
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figures or solid shapes that have the same shape and size
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14
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Two angles that share the same vertex and have one side in common between them
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16
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An angle with a measure between 0° and 90°
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17
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A seven-sided plane figure
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19
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Lying on the same straight line
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20
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conditional statement by interchanging the 'if' part and the 'then' part
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