MathDB

Let

K

be the circumscribed circle of the trapezoid

ABCD

. In this trapezoid the diagonals

AC

and

BD

are perpendicular. The parallel sides AB\equal{}a and CD\equal{}c are diameters of the circles

K_{a}

and

K_{b}

respectively. Find the perimeter and the area of the part inside the circle

K

, that is outside circles

K_{a}

and

K_{b}

3