Teach your students to sort triangles as acute, right, or obtuse based on their internal angle type.

Children find the unknown angles for five triangles, then identify whether the triangle is right, acute, or obtuse, in this geometry worksheet.

Fifth graders review types of angles, triangles, and polygons in this handy geometry review.

In this excerpt from an upcoming math workbook, your junior detective will make a positive ID on obtuse, acute and right angles.