105 double-sided, easy to read, 6-1/4" x 3-3/4" (16cm x 10cm) cards printed on high quality stock. Cards feature four levels of difficulty and practice with solving for unknown angles in triangles. Cards address supplementary, complementary, vertical, and right angles. Students can challenge themselves by identifying the type of triangle based on the angle measures - scalene, equilateral, isosceles, and right triangles. GR: 3 and up.