Missing Angles Related Worksheets Find the missing angles in a triangle, around a point, in a quadrilateral, find opposite and supplementary angles, or find angles which require multi-step problem solving skills. For more shape and space resources click here. Game Objectives New Maths Curriculum: Year 3: Identify right angles, recognise that two right angles make a half-turn, three make three quarters of a turn and four a complete turn; identify whether angles are greater than or less than a right angle Year 4: Identify acute and obtuse angles and compare and order angles up to two right angles by size Year 5: Identify: multiples of 90°, angles at a point on a straight line and ½ a turn (total 180°); angles at a point and one whole turn (total 360°); reflex angles; and compare different angles Year 6: Find unknown angles where they meet at a point, are on a straight line, and are vertically opposite