Make triangle ABC, make angle a = 45 degrees, angle B = 30 degrees, ab = 5cm, and draw with ruler

1. Draw a line and use a compass to make a vertical bisector to get a right angle,
2. Use a compass to make a right angle bisector to get a 45 ° angle,
3. Measure 5cm with ruler on a line to get AB side,
4. Draw another right triangle def, and make the angle e = 90 °, EF \ \ AB, de = 2ef, then the angle d = 30 °,
5. Make parallel lines BC \ \ DF,
6. Finished! OK

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