If the circumference of trapezoid ABCD is 25cm, ab \ \ CD, de \ \ BC and intersects AB with E, what is the circumference of triangle ade Can you give me more details? Maybe there are other ways?

If the circumference of trapezoid ABCD is 25cm, ab \ \ CD, de \ \ BC and intersects AB with E, what is the circumference of triangle ade Can you give me more details? Maybe there are other ways?

Because ab \ \ CD, de \ \ BC, BCDE is a parallelogram
So de = BC, be = CD
L (triangle ADE) = AD + de + AE = AD + AE + BC
L (ladder ABCD) = 25 = CD + BC + be + AE + ad
So l (triangle ADE) = 25-2cd
There must be a few conditions for this topic, which can only be regarded as this step