Angles in Quadrilaterals Practice 11 Plus
19 October 2026
Understanding quadrilaterals
A quadrilateral is simply a four-sided shape, such as a rectangle, square, parallelogram, or trapezium. Each one has four angles inside.
The key angle rule
No matter the shape, the internal angles of any quadrilateral always add up to 360 degrees. This is a crucial fact for 11+ geometry questions.
Why this matters for the 11+
Children are often asked to find a missing angle in a quadrilateral. Knowing that all four angles add up to 360° helps them quickly check their answers and solve these questions with confidence.
How to find a missing angle
Add together the three known angles, then subtract that total from 360°. The answer is the missing angle. For example, if the three angles are 90°, 80°, and 110°, add them to get 280°, then 360°, 280° = 80°.
Key insight: Practice makes a difference
While many resources explain the angle sum rule, children benefit most from targeted practice. Interactive worksheets, like those at EEZY BREEZY MATHS, help reinforce this skill and build exam confidence.
Tips for supporting your child
Encourage your child to draw quadrilaterals and label the angles. Practise adding three angles and finding the missing one together. If a mistake is made, talk through each step calmly to spot where things went wrong.
Interactive practice available
EEZY BREEZY MATHS offers dedicated angles in quadrilaterals practice for the 11+, with instant feedback and progress tracking. Visit the Angles in Quadrilaterals package to get started.
