If AB = 4, AC = 6, then the value range of ad is___ .
As shown in the figure, extend ad to e, so that de = ad, ∵ ad is the middle line on the edge of BC, ∵ BD = CD, in △ abd and △ ECD, ∵ BD = CD ∠ ADB = ≌ edcde = ad, ≌ abd ≌ ECD (SAS),
RELATED INFORMATIONS
- 1. In △ ABC, ad is the middle line on the edge BC. If AB = 8, AC = 6, then the value range of the middle line ad is______ .
- 2. Triangle ABC, de parallel BC, known: ad = 10, BD = 5, EC = 4, what is AE -- I'm confused. Help
- 3. In △ ABC, ab = 5, AC = 3, ad is the middle line on the edge of BC, then the value range of ad is______ .
- 4. It is known that ad is the middle line on the ABC side and BC side of the triangle, ab = 12 and AC = 8. The value range of ad is obtained
- 5. In △ ABC, ∠ C = 60 ° and high be passes through the midpoint F of high ad, be = 10cm, the length of BF and EF can be calculated
- 6. The two sides of an isosceles triangle are 6.2 cm and 12.4 cm long respectively. What is the circumference of this isosceles triangle
- 7. The middle line on the waist of an isosceles triangle divides the circumference of the isosceles triangle into two parts: 15cm and 12cm
- 8. It is known that the length of the base of an isosceles triangle is 15cm. If the difference between the two parts is 8cm, the waist length is______ cm.
- 9. It is known that the two sides of an isosceles triangle are 3cm and 8cm, respectively______ .
- 10. Known: as shown in the figure, in the isosceles subangular triangle ABC, D is the midpoint of the hypotenuse AB, P is on BD, PM is perpendicular to BC, m, PN is perpendicular to AC, N, DM is equal to DN
- 11. In the triangle ABC, the bisector angle of Bo ABC ad is vertical to BD, and the perpendicular foot is d AE = EC to prove the parallel BC of de
- 12. As shown in the figure, D is on the BC side of △ ABC, AC and de intersect at point F, ab = ad, ∠ bad = ∠ EAC ∠ EDC
- 13. As shown in the figure, in △ ABC, ad is the middle line on BC, e is the point on ad, and CD = CE, ∠ EAC = ∠ B, try to explain △ AEC ∽ BDA
- 14. Triangle ABC, triangle ace and triangle BCF are equilateral triangles with AB, AC and BC sides of triangle ABC respectively. Quadrilateral ADFE is a parallelogram Give reasons
- 15. In △ ABC, ∠ C = 90 °, AC = 2.1cm, BC = 2.8cm. (1) find the area of △ ABC; (2) find the length of hypotenuse AB; (3) find the length of height CD
- 16. In the triangle ABC, the angle c = 90 °, ab = 2.1cm, and the angle BC = 2.8c, why is the height CD calculated by multiplying the area by 2 and then dividing the hypotenuse
- 17. As shown in the figure, in the triangle ABC, ad is the height on the bottom BC, the area of triangle ABC = 6 square centimeters, ad = 2 centimeters, and the distance from point C to ad is 2 Cm, find the distance from point B to AD
- 18. In the triangle ABC, D is the midpoint of BC, AC = 3ec, the area of CDE is 6 square centimeters, what is the area of ABC
- 19. As shown in the figure below, a is the midpoint on the de side of the triangle CDE, BC is equal to two-thirds of CD, if the area of the triangle ABC (shadow part) is 10 square centimeters, find three Area of angular abd and triangular ace?
- 20. Calculate the surface area of the half cylinder in centimetres High: 40 Diameter: 10