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1. Given: Circle O, CD is diameter, chords: AB || CD. Arc AB= 68 degrees, Find Arc CA
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1. Given: Circle O, CD is diameter, chords: AB || CD. Arc AB= 68 degrees, Find Arc CA

1. Given: Circle O, CD is diameter, chords: AB || CD. Arc AB= 68 degrees, Find Arc-example-1
User JasonS
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Since AB || CD, and CD is diameter, then arc DB=CA.
If AB=68 degrees, and DB= arc CA,
CA+DB= 180-68 or 2CA= 112
2CA=112
CA=112/2
CA=56
User Ahmed Hamdy
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7.3k points
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