In △ ABC, ∠ A: B: C = 1:1:2, then ∠ C = 90 ° if CD is an angular bisector and CD = 5cm, then ab=

According to the triangle ratio and angle c 90 degrees, angle a = angle B = 45 degrees, so the triangle is an isosceles right triangle, so ad = CD = BD, so AB = 10

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