Here are some geometry activities you can try out next:
Khan AcademyAt KhanAcademy.org you will find some recommended skills to practice. ProofsProofs are like puzzles. To prove something in geometry, you can only use other geometry facts you already know. You can't use measuring in a proof!
1) Angles in a trapezoid  Draw a pair of parallel lines
 Draw TWO transversals. Do not connect them.
 Pairs of supplementary angles
 What's the sum of the interior angles? How can you know this WITHOUT MEASURING THEM?
2) Angles in a triangle  Using lines (not line segments), draw a triangle
 Select a vertex and the line opposite that vertex. Construct a parallel line.
 Using what you know about parallel lines cut by a transversal, find the two ? angles.
 What is the sum of the interior angles of the triangle? How can you know this without measuring them?
