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In the adjoining figure chords AC and BD of a circle O, intersect at right angles at E. If `/_ AOB = 25^@` calculate `/_EBC` |
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Answer» OA=OB `/_OAB=/_OBA=25^0` `/_OAB` `/_A+/_O+/_B=180^0` `50^0+/_AOB=180^0` `/_AOB=130^0` `/_ACB=1/2*/_AOB` `/_ACB=1/2*130=65^0` In`/_BEC` `/_ECB+/_EBC+/_CEB=180^0` `65^0+/_EBC+90^0=180^0` `/_EBC=25^0`. |
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