初中数学八年级下册（648题）

---

当\(\angle BAD = 100^\circ \)时，求\(\angle EAF\)的度数。

知识点：复习

参考答案：解：
\(\because \)四边形\(ABCD\)是菱形，
\(\therefore AD//BC\)，
\(\therefore \angle BAD + \angle B = 180^\circ \)，
\(\because \angle BAD = 100^\circ \)，
\(\therefore \angle B = 80^\circ \)
\(\because AE \bot BC\)，
\(\therefore \angle AEB = 90^\circ \)，
\(\therefore \angle BAE = 10^\circ \)，
\(\therefore \angle DAF = 10^\circ \)，
\(\therefore \angle EAF = \angle BAD - \angle BAE - \angle DAF \)
\(= 100^\circ - 10^\circ - 10^\circ = 80^\circ \)。