Question

2
21. The 7th term of an A.P is 20 and 11s ry
22. If a quadrilateral ABCD circumscribe a circle, prove that AB + CD = AD + BC
a +=aß then the value oft -
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Answer 1

PROVE THAT:AB+CD=AD+BC

PROOF:

AP=AS -----1

PB=BQ -----2 [TANGENTS DRAWN FROM

CR=CQ -----3 EXTERNAL POINTS ARE

DR=DS -----4 EQUAL

AB+CD= AP+PB+CR+DR ( from the above diagram)

= AS+BQ+CQ+DS [FROM 1,2,3,4]

= (AS+DS)+(BQ+CQ)

= AD+BC