英语翻译英语数学题帮翻译下Angle ABC of △ABC is a right angle.The sides of

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英语翻译
英语数学题帮翻译下
Angle ABC of △ABC is a right angle.
The sides of △ABC are the diameters of semicircle as shown.The area of the semicircle on BC equals 8pi,and the arc of the semicircle on AC has length 8.5pi.What is the radius of the semicircle on BC?

Angle ABC of △ABC is a right angle.
角ABC是△ABC中的直角.
The sides of △ABC are the diameters of semicircle as shown.
△ABC的边是半圆的直径,如图所示.
The area of the semicircle on BC equals 8pi,and the arc of the semicircle on AC has length 8.5pi.
BC上的半圆面积等于8pi, AC上的半圆弧长为8.5pi.
What is the radius of the semicircle on BC?
在BC上的半圆的半径是多少?

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