WHAT HAVE I LEARNED ABOUT TRIANGLES?

1. On what basis are triangles classified? Which kind of triangles do you know?

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2. Each angle of triangle ABC corresponds to a particular angle of triangle A´B´C´. Is it right to say that these triangles are equal?
.Each side of triangle KLM corresponds to a particular side of triangle K´L´M´. Is it right to say that these triangles are equal?

3. What kind of data are needed to calculate?

· the perimeter of triangle?

· the area of a triangle?

4. Two angles of a triangle are 39.2° and 93.5°. Find the third angle. Is this triangle acute, obtuse or right?