3.直角三角形的三角比。銳角三角比。例題2。舉一反二。畢氏定理。
Synopsis
只要知道一個，就能推得另外兩個。
![[0147]直角三角形的三角比](https://i.ytimg.com/vi/8mkVttvQWKU/hq720.jpg?sqp=-oaymwE2CNAFEJQDSFXyq4qpAygIARUAAIhCGAFwAcABBvABAfgB_gmAAtAFigIMCAAQARhlIGUoZTAP&rs=AOn4CLCjzhl0SvsuikoGbPrXfdTUogmypQ)
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