The equation to the sides AB,BC,CA of a △ are x+y=1;4x−y+4= and 2x+3y=6. Circle are drawn on AB,BC,CA as diameter. The point of concurrence of the common chord is
A
centroid of the triangle
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B
orthocenter
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C
circumcenter
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D
incenter
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Solution
The correct option is C orthocenter Since ∠ADB=∠ADC=900, circle on AB and AC as diameter pass through D and therefore the altitude AD is the common chord.
Similarly, the other two common chords are the other two altitudes and hence they concur at the orthocenter.