brennamclemore brennamclemore

25-06-2017
Mathematics

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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 CA class=

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brennababe9 brennababe9

25-06-2017

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

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