Geometry & MeasuresStudy Notes
Worked Example 1: Finding a Missing Angle
Part of Properties of Triangles — GCSE Mathematics
This study notes covers Worked Example 1: Finding a Missing Angle within Properties of Triangles for GCSE Mathematics. Revise Properties of Triangles in Geometry & Measures for GCSE Mathematics with 12 exam-style questions and 3 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 4 of 8 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 4 of 8
Practice
12 questions
Recall
3 flashcards
Worked Example 1: Finding a Missing Angle
A triangle has angles of 65° and 48°. Find the third angle.
Step 1 Use the angle sum rule
Angles in a triangle sum to 180°
65° + 48° + x = 180°
Step 2 Solve
113° + x = 180°
x = 180° − 113° = 67°