Triangles Worksheets

Practice finding missing angles using the Triangle Angle Sum Theorem. Students solve a variety of triangle problems to build accuracy and confidence in geometry.

Practice finding missing side lengths in 30–60–90 and 45–45–90 triangles with this clear geometry worksheet. Strengthen ratio skills and triangle understanding.

Classify triangles as acute, right, or obtuse in this visual geometry worksheet. Students identify angle types and strengthen foundational triangle classification skills.

Practice finding missing angles using the Triangle Sum Theorem. Students solve diagrams involving intersecting lines, multi-step triangles, and angle relationships.

Solve missing angles on a straight line with this supplementary angles worksheet. Students practice finding unknown angles that add up to 180°. Great for Grades 4–6.

Practice finding complementary angles with this worksheet featuring right-angle diagrams and missing angle problems. Ideal for Grades 4–6 geometry review.

Practice real-world right triangle problems using Pythagorean theorem, SOHCAHTOA, and special triangles. Solve for distances, heights, and perimeters with clear scenarios.

Practice solving right triangles using SOHCAHTOA. Students use sine, cosine, and tangent to find missing sides and build essential trigonometry skills.

Classify triangles by angle and side types, then sketch examples of given triangle descriptions. A clear, engaging worksheet for mastering triangle classification.

Practice using the Triangle Angle Sum Theorem to find missing angles. Includes right and scalene triangles to strengthen students’ geometry and angle-measure skills.

Strengthen geometry skills with this similar triangles worksheet. Students use proportions to find missing side lengths in each pair of similar triangles. Ideal for Grades 7–10.

Practice identifying similar triangles with this worksheet. Students analyze side lengths and angles, justify similarity using AA/SAS/SSS, and complete similarity statements.

Classify six triangles by name and properties in this geometry worksheet. Students identify equilateral, isosceles, scalene, acute, right, and obtuse triangles.

A clear reference chart explaining the AA and SAS rules for similar triangles. Perfect for Geometry students learning triangle similarity and proportional reasoning.

Practice complementary and supplementary angles with this worksheet featuring equations and diagrams. Perfect for Grades 5–7 to build geometry and problem-solving skills.

Practice solving for missing angles using the Triangle Sum Theorem. Includes scalene, right, and isosceles triangles plus algebraic angle expressions for deeper reasoning.

Learn how drawing an altitude to the hypotenuse creates similar right triangles. This worksheet explains angle relationships and similarity statements. Perfect for Geometry.

Practice finding missing angles using the Triangle Angle-Sum Theorem. Students solve a variety of triangle problems to build accuracy and confidence in geometry.

Classify triangles by their angles and sides using labeled diagrams. Students identify acute, right, obtuse, scalene, isosceles, and equilateral triangles with confidence.

Identify the correct congruence test—SSS, SAS, ASA, AAS, or HL—for each pair of triangles. Students analyze markings and explain why the triangles are congruent.