请帮我解一道三角函数的数学题,determine the length of an arc opposite an angle of 2.5 radians in a circle of radius 2.

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请帮我解一道三角函数的数学题,determine the length of an arc opposite an angle of 2.5 radians in a circle of radius 2.
请帮我解一道三角函数的数学题,
determine the length of an arc opposite an angle of 2.5 radians in a circle of radius 2.

请帮我解一道三角函数的数学题,determine the length of an arc opposite an angle of 2.5 radians in a circle of radius 2.
.就是算一个半径为2,弧度为2.5的角对的圆弧的长嘛.= =
公式为弧长L=半径R*弧度a.自己算吧.= =