### বৃত্তের মধ্যে আয়ত

##### Score: 2 Points

$ABCD$ is a rectangle, $D$ is the center of the circle, and $B$ is on the circle. If $AD=4$ and $AC=5$ ,the area of the shaded region is $\frac {(aπ-b)}{4}$ then what is the value of $a+b$ $?$

Source: BdMO

Geometry

Tried 181

Solved 168