12. One side of a triangle is 20cm, the other is 1.4 times longer than that and the third one forms 60% of the first side. Find the circumference of the triangle.
13. Can you draw a triangle, if CB = 2cm, CA = 3cm and the angle is C = 180o. Give the reasons!
14. In the triangle KLM angle L is 120o and sides LK = 3.5cm and LM=5cm. Draw the triangle KLM.
15. Which of these equalities are true?
