Cambridge questions are written in precise mathematical English. If you know exactly what product, difference, justify and estimate ask you to do, you will not lose marks answering the wrong question.
| Term | What it means | Example |
|---|---|---|
| angle | A measure of turn, given in degrees. | A right angle is 90°. |
| degree | The unit for measuring angles. | A full turn is 360°. |
| acute angle | An angle less than 90°. | 35° is acute. |
| right angle | An angle of exactly 90°. | The corner of a square is a right angle. |
| obtuse angle | An angle between 90° and 180°. | 128° is obtuse. |
| reflex angle | An angle greater than 180°. | 250° is reflex. |
| intersecting lines | Lines that cross each other. | Two roads that cross. |
| vertically opposite angles | The angles opposite each other where two lines cross. | They are always equal. |
| perpendicular | Meeting at a right angle. | The bars of a window frame. |
| parallel | Always the same distance apart, never meeting. | Railway tracks. |
| transversal | A line that crosses a pair of parallel lines. | It creates equal corresponding angles. |
| corresponding angles | Angles in matching positions on parallel lines, in an F shape. | They are equal. |
| alternate angles | Angles on opposite sides of a transversal, in a Z shape. | They are equal. |
| protractor | The instrument used to measure and draw angles. | It is marked from 0° to 180°. |
| quadrilateral | A shape with four straight sides. | Its angles total 360°. |
| square | Four equal sides and four right angles. | Every square is a rectangle. |
| rectangle | Four right angles, opposite sides equal. | A door is a rectangle. |
| rhombus | Four equal sides, opposite angles equal. | A diamond shape. |
| parallelogram | Two pairs of parallel sides. | Opposite angles are equal. |
| trapezium | Exactly one pair of parallel sides. | A ramp seen from the side. |
| kite | Two pairs of equal sides next to each other. | It has one line of symmetry. |