A collection of seven worksheets on the following topics:

Classifying Triangles. There is a worksheet on classifying triangles by their sides, a worksheet on classifying triangles by their angles and a worksheet on classifying triangles by their sides and angles. The students are given some triangles to classify and in some cases they are required to find missing angles of the triangles (using the triangle angle sum theorem). In addition they are given some other exercises (true/false, blanks to complete) in order to test their knowledge on the different types of triangles.
Triangle Angle Sum Theorem. There is a worksheet on the triangle angle sum theorem. The exercises require to find missing angles by using the triangle angle sum theorem and the properties of special types of triangles (isosceles and equilateral).
Exterior Angle Theorem. There is a worksheet on the triangle exterior angle theorem. The exercises require to find missing angles by using the triangle exterior angle theorem.
Triangle Angle Sum Theorem and Exterior Angle Theorem. There is a worksheet on the triangle angle theorem and triangle exterior angle theorem. The exercises require to find missing angles by using the two theorems.
Parallel Lines Cut by A Transversal. There is a worksheet to help students strengthen their skills in the concept of parallel lines cut by a transversal. The following angle relationships occur in the exercises: complementary angles, supplementary angles, vertical angles, alternate interior angles, alternate exterior angles, consecutive interior angles and corresponding angles. In the first two exercises, students are given a diagram with two parallel lines cut by a transversal and are required to identify the relationships between some given pairs of angles. In the next exercises, students are given some diagrams with missing angles which are required to find by using their knowledge on the topic. Elementary and harder exercises are included.
Detailed solutions are included.

Ready-to-print KS3 and GCSE Maths worksheets pack! Includes comprehensive practice pages and full step-by-step solutions for angles in parallel lines, triangle angle sums, and properties.

Master essential geometry concepts with this comprehensive, ready-to-print maths worksheets pack!
Designed perfectly for Key Stage 3 (KS3) and GCSE foundation/higher tiers (Years 9, 10, and 11), this resource provides structured, scaffolded practice for students learning to identify angle facts and calculate missing measurements. Whether you need independent classwork, homework tasks, revision packs, or emergency cover lessons, these printable pages are completely ready to go.

What’s Included in This Pack?
• Angles in Parallel Lines: Practice identifying and using alternate, corresponding, co-interior (consecutive interior), vertically opposite, and supplementary angles.
• Angles in Triangles: Missing angle calculations ranging from simple numeric problems to multi-step algebraic equations.
• Exterior Angle Theorem: Targeted problems to help students master the rule that the exterior angle equals the sum of the two opposite interior angles.
• Classifying Triangles: Sorting activities to identify triangles by their sides (scalene, isosceles, equilateral) and by their angles (acute, right-angled, obtuse).
• Full Step-by-Step Solutions: Complete, detailed teacher answer sheets are included for every single problem to allow for quick marking or student self-assessment!

Curriculum Alignment
• KS3 National Curriculum: Apply conventional terms and notations for points, lines, parallel lines; derive and illustrate properties of triangles; use alternate and corresponding angles.
• GCSE Maths (AQA, Edexcel, OCR): Standard geometry properties involving angles in parallel lines, triangles, and polygon angle facts.