请问这张图中C点是怎么计算的?请说明详细步骤，谢谢了

Question

请问这张图中C点是怎么计算的?

请说明详细步骤，谢谢了

Answer 1

圆心坐标O（80,26）
alpha = arctan(14/80)
BO = 根号（80^2 + 14^2) = 81.2
BC = 根号（BO^2 - OC^2) = 75.5
alpha = arctan(14/80)
beta = arctan(30/75.5)
Cx = BC * cos(alpha+beta) = 64.2
Cy = 12 + BCsin(alpha+beta) = 51.55