options: 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.

Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.
problem_activity: Problem 1
Use the following angles to answer the questions below.
[IMG]
Write the letters of the angles that are:
right angles: _____________________
acute angles: _____________________
obtuse angles: _____________________
straight angles: _____________________
Problem 2
Draw an additional example of each type of angle below.
a.   Right angle:
b.   Obtuse angle:
c.   Acute angle:
d.   Straight angle:


correct_option_index: 2