1 / 18

2.5 直角三角形

2.5 直角三角形. 宁波市惠贞书院 高友军. A. B. C. 请你算一算:. 广告牌. 电线杆. 楼梯. B. 直角边. C. A. 直角边. 斜边. 巩固练习(一). A. D. B. C. 巩固练习(二). 例 1 :如图, CD 是 Rt ABC 斜边上 的高,请找出图中各对互余的角。. C. A. B. D. 巩固练习(三). 请你算一算 :. A. C. D. B. 做 一 做. 例 2 :如图,在等腰直角三角形 ABC 中, AD 是斜边 BC 上的高,则 AD=BD=CD.

mele
Download Presentation

2.5 直角三角形

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 2.5 直角三角形 宁波市惠贞书院 高友军

  2. A B C 请你算一算:

  3. 广告牌 电线杆 楼梯

  4. B 直角边 C A 直角边 斜边

  5. 巩固练习(一) A D B C

  6. 巩固练习(二)

  7. 例1:如图,CD是Rt ABC斜边上 的高,请找出图中各对互余的角。 C A B D

  8. 巩固练习(三)

  9. 请你算一算:

  10. A C D B 做 一 做 例2:如图,在等腰直角三角形ABC中, AD是斜边BC上的高,则AD=BD=CD. 请说明理由.

  11. A B C D 巩固练习(四)

  12. 1 C 2 A B D 让我们来试一试直角三角形的判定!

  13. C A B O 拓展训练:

  14. A D A E B C (3) D (2) B C

  15. B1 A A1 D B C

  16. 思考题: 在4×4的正方形网格中,能画出几个 大小不一的等腰直角三角形? (三角形的顶点都是网格的顶点)

  17. 小结:

More Related