Question

plss sol 17 ,give an appropriate solution

Answer 1

let P,Q,R,S be the points where the touches the quadrilateral.
{from a point outside the circle two tangents are equal}
therefore AP=AS,BP=BQ,CR=CQ,DR=DS
AB + CD = AD + BC
6 + 4 = AD + 7
AD=3cm

Answer 2

above is the right answer for sure