We just passed the exam. It's simple. I got 100! ! First, multiple-choice questions: (This question has 8 small questions, each with 3 points and ***24 points. ) As shown in the figure, it is known that AB‖CD, if ∠ 1 = 50, then the degree of ∠2 is () a, 50 B, 60 C. It is () a. ∠1= ∠ 4b. ..

In △ABC, the angle C is equal to 90 degrees, AC is equal to BC, the bisecting angle CAB of AD passes through BC to D, and the vertical angle AB of DE is equal to E. If AB is equal to 6 cm, find the circumference of △DBE.

As shown in the figure, AD ⊥ CD, AB = 10, BC = 20, A = ∠ C = 30. Find the length of AD AD CD.

Too many don't want to write hee hee!