Q1 Find angle x in a triangle where the other angles are 72° and 53°.
72° + 53° + x = 180°
x = 180° − 125° = 55°
Q2 An isosceles triangle has a top angle of 56°. Find each base angle.
56° + 2x = 180°
2x = 124°
x = 62°
Q3 Find the exterior angle at C if the interior angles at A and B are 53° and 65°.
Exterior at C = sum of opposite angles
Exterior = 53° + 65° = 118°
Q4 What is each angle in an equilateral triangle?
All angles equal, sum to 180°
Each angle = 180° ÷ 3 = 60°
This study notes covers Practice Questions 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. Use this page as part of a wider topic revision path rather than treating it as an isolated fact. It is section 8 of 9 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for Properties of Triangles
What is the sum of the interior angles of any triangle?
Describe the key properties of an equilateral triangle. State two properties relating to sides and two relating to angles.