A quadrilateral ABCD is drawn to circumscribe a circle. Prove that AB + CD = AD + BC.
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let quad ABCD circumscribe a circle or all sides are tangent to it.
let AB touch the circle at P
BC touch the circle at Q
CD touch the circle at R
DA touch the circle at S
AP=AS
RD=DS
RC=QC
PB=BQ OR, AP+RD+RC+PB=AS+DS+QC+BQ OR, AB+CD=AD+BC
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