Consider sector of a circle $OAB$.
Circle with center $ M $ touches $OA$ at $P$, $OB$ a $Q$ and arc $AB$ at $N$.
Circle with center at $L$ touches $OA$ at $C$, $OB$ at $D$ and circle with center $M$ at $K$.
$OA = 98$. $MP = 21$.
I can't even begin. I think $ O , L , M $are colinear and then $\triangle OCL$ and $\triangle OPM$ are similar.I don't know what to do. Please give some starting hint.