standard_description: Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify line-symmetric figures and draw lines of symmetry.
problem_activity: Problem 1
Draw a right scalene triangle.
Problem 2
Draw an acute isosceles triangle.
Problem 3
True or false: all triangles have at least 2 acute angles.


aligns: no