As shown in the figure, there is an isosceles triangle in an equilateral triangle, and angle one equals angle two, and angle three equals angle four. Can you find the degree of angle five?

60 degrees △ 2 × 2 = 60 degrees, 180 degrees - 60 degrees = 120 degrees

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1. Solve the problem. (1) the circumference of a triangle is 68 cm, the length of side a is 30 cm, and the length of side B is 19 cm. How many cm is the length of side C? What triangle is this? (2) As shown in the figure, there is an isosceles triangle in an equilateral triangle, and ∠ 1 = 2, ∠ 3 = 4. Can you find the degree of ∠ 5?
2. In the following figure, there is an isosceles triangle in an equilateral triangle, and if angle 1 equals angle 2 and angle 3 equals angle 4, then angle 5 equals?
3. As shown in the figure, in △ ABC, ∠ BAC = 4 ∠ ABC = 4 ∠ C, BD ⊥ AC, the vertical foot is D, find the degree of ∠ abd
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11. 5. As shown in the figure, there is an isosceles triangle in an equilateral triangle, and
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