Given that the triangle ABC is an equilateral triangle, take points E and F on AC and BC respectively, and AE = CF, be and AF intersect at point D, then ∠ BDF = what The next two questions of this question, the last question of Changjun bilingual mathematics school-based similar triangle judgment 4

Given that the triangle ABC is an equilateral triangle, take points E and F on AC and BC respectively, and AE = CF, be and AF intersect at point D, then ∠ BDF = what The next two questions of this question, the last question of Changjun bilingual mathematics school-based similar triangle judgment 4

It is known that the triangle ABC is an equilateral triangle, take points E and F on AC and BC respectively, and AE = CF, be and AF intersect at point D, then ∠ BDF = how much? In △ BAE and △ ACF, ab = AC, ∠ BAE = 60 ° = ∠ ACF, AE = CF, so, △ BAE ≌ Δ ACF, we can get: ∠ Abe = ∠ CAF, ∠ BDF = ∠ ade = ∠ B