As shown in the figure: in △ ABC, ∠ B = 90 °, ab = BD, ad = CD, calculate the degree of ∠ CAD

In ∵ △ ABC, ∵ B = 90 °, ab = BD, ad = CD ∵ bad = ∵ ADB = 45 °, DCA = ∵ CAD ∵ BDA = 2 ∵ CAD = 45 ∵ CAD = 22.5 ∵

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1. In △ ABC, ∠ BAC = 90 °, BD bisection ∠ ABC, AE ⊥ BC in E. verification: AF = ad
2. As shown in Figure 10, AD / / BC, ad = 5 cm, the area of triangle abd is 10 square cm, what is the height of ad side of triangle ACD
3. As shown in the figure, ad = 2, AC = 4, BC = 6, ∠ B = 36 °, ∠ d = 117 °, △ ABC ∽ DAC. (1) find the length of AB; (2) find the length of CD; (3) find the size of ∠ bad
4. As shown in the figure: in △ ABC, BC = 5, extend BC to point D, so that ∠ DAC = ∠ B, ad = 6, then CD=______ ．
5. As shown in the triangle ABC, ad is perpendicular to D under the following conditions: (1) angle B + angle DAC = 90 degrees, (2) angle B = angle DAC, (3) CD of ad = AC of AB, (4) The square of AB = BD times BC, where it is certain to determine that the triangle ABC is a right triangle, there are choices a, 1 B, 2 C, 3 D, 4
6. It is known that: as shown in the figure, in the triangle ABC, ad is the bisector of ∠ BAC, and the extension line of intersection Ba of CE ‖ ad through point C is at E
7. As shown in the figure, ∠ ACB = 90 ° in △ ABC, ad bisects ∠ BAC, de ⊥ AB in E
8. As shown in the figure, ∠ ACB = 90 ° in △ ABC, ad bisects ∠ BAC, de ⊥ AB in E
9. As shown in the figure, in △ ABC, AE is the median line, ad is the angular bisector, AF is high, fill in the blanks: (1) be=______ =12______ （2）∠BAD=______ 12______ （3）∠AFB=______ =90°（4）S△ABC=______ S△ABE．
10. It is known that, as shown in the figure, in △ ABC, ∠ BAC = 90 ° ad ⊥ BC is at point D, be bisects ∠ ABC, intersects ad at point m, an bisects ∠ DAC, intersects BC at point n
11. In △ ABC, ab = AC, ad is the midline on the side of BC, if AB = 17, BC = 16, then ad =?
12. In the triangle ABC, AB equals 20, AC equals 12, D is the middle line, and ad equals 8, find the length of BC
13. In the triangle ABC, ad is the middle line on the side of BC, AB is equal to 6, ad is equal to 5, AC is equal to 8 It's urgent!
14. In the triangle ABC, AB equals 5, AC equals 7, ad is the middle line on the side of BC, then the range of ad is?
15. As shown in the figure, D is a point on the edge BC of △ ABC. Given AB = 13, ad = 12, AC = 15, BD = 5, then the length of BC is______ ．
16. In the triangle ABC, ab = 13, AC = 15, BC = 14!
17. In △ ABC, ab = AC, ad = 2, ad is the middle line of △ ABC, AE is the angular bisector of ∠ bad, DF ‖ AB intersects the extension of AE at point F, and the length of DF is calculated
18. In △ ABC, AE bisection ∠ BAC intersects BC with E, de ‖ AC intersects AB with D, and DF ‖ BC intersects AC with F
19. In the triangle ABC, the angles C = 90 °, D and E are the points on AB and AC respectively. Ad times AB = AE times AC, it is proved that ED is perpendicular to ab C: [documents and settings] administrator [desktop] unnamed.jpg
20. As shown in the figure, in the angle ABC, the angle c = 90 degrees, D and E are the points on AB and AC respectively, and ad · AB = AE · AC, then ed Is it perpendicular to ab? Please explain why