| 求三角形中的角度 |
| 送交者: GoLion 2008年01月11日10:29:44 于 [灵机一动] 发送悄悄话 |
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In a triangle ABC, angle A=80, B=80, C=20. D is on line AC and E is on line BC. Angle DBC is 20 and CAE is 10. Is AED=30? Proof of disproof. The instructor told my girl that use geometry only no sin or cos, etc. Thanks if you can help.
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