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设P是椭圆x2/a2+y2/b2=1(a>b>0)上的一点,F1、F2是椭圆的两个焦点,我们称∠F1PF2为椭圆周角,三角形PF1F2为焦点三角形,设∠F1PF2=θ为椭圆周角,焦点三角形PF1F2
Let P be a point on the ellipse x2 / a2 + y2 / b2 = 1 (a> b> 0). F1 and F2 are the two focal points of the ellipse. We call ∠F1PF2 the angle of the ellipse and triangle PF1F2 as the focal triangle ∠F1PF2 = θ for the oval angle, the focus of the triangle PF1F2