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OpenStudy (anonymous):
AB←→ is perpendicular to CD←→. How many 90° angles are formed by the intersection?
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OpenStudy (ipwnbunnies):
Are they both lines? I guess that's what those arrows mean. |dw:1410913464627:dw| They are perpendicular, so the lines should form 90 degree angles. And they will form 4 angles.
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