题目

Problem

The diagram shows a sector $OAB$ of a circle with centre $O$ and radius $r$ cm. Angle $AOB = 1$ radians. It is given that the length of the arc $AB$ is $9.6$ cm and that the area of the sector $OAB$ is $76.8$ cm $^2$ .

(a) Find the area of the shaded region.

[5]

(b) Find the perimeter of the shaded region.

[2]

题目中文翻译

图中显示圆心为 $O$ 、半径为 $r$ cm 的圆的扇形 $OAB$ 。角 $AOB = 1$ 弧度。已知弧 $AB$ 的长度为 $9.6$ cm，扇形 $OAB$ 的面积为 $76.8$ cm $^2$ 。

(a) 求阴影区域的面积。

[5]

(b) 求阴影区域的周长。

[2]

CIE 9709 2023 June Paper 13 Q6

题目

解答