How to calculate the distance CD?

Help plz))
Do something stupid out...
AB= r(a known value)
BE= r;(known value)
BC = x(known value)
Need to get CD
July 2nd 19 at 13:17
2 answers
July 2nd 19 at 13:19
DC = r - sqrt(BC * (2 * r - BC))
July 2nd 19 at 13:21
Using arctangent to find the angle using cosine find the projection of D on the X-axis, and when you subtract the cosine from unity, we get just the same distance DC to the unit circle, domega radius obtained physical distance DC. It is important not to confuse measures of angle measurement. If the inverse tangent in radians, then the cosine is needed, which is considered to be of a radian or to translate radians to degrees and to consider the cosine of the angle in degrees

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