Why Lesson Planet?
In this triangles worksheet, 10th graders solve 3 extensive informal geometry problems that involve triangles. First, they sketch a triangle, selecting 3 of the sides and constructing 3 midpoints. Students then draw each of 3 medians by selecting a vertex and midpoint on the opposite side and constructing a line. Finally, they select one of the vertices of the triangle and check that the ratio does not change.