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Seventh grade math problems, online speed~~~ As shown in the figure, the triangle ABC is an equilateral triangle, and the point D is the midpoint on the side of BC, which is the degree of ∠ B, ∠ DAC A triangle is isosceles with a vertical bisector in the middle It is known that in triangle ABC, ab = AC, ad bisects ∠ BAC, intersects BC with D, the circumference of triangle ABC is 36, and the circumference of triangle ADC is 30 cm
∠B=60
DAC=30
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