Year 6 Angles, Shapes and Circles: lesson and practice

By the end of this chapter you will be able to

• Find a missing angle on a straight line (180 degrees), at a point (360 degrees) and opposite a crossing
• Find the missing angles in triangles and quadrilaterals, and the angles of an isosceles triangle
• Work out the interior angles of a polygon, and each angle of a regular polygon
• Name the radius, diameter and circumference of a circle, and use the diameter is twice the radius
• Work out the circumference of a circle using pi = 3.14 or 22/7
• Draw a shape from its sides and angles, and count the faces, edges and vertices of a 3-D shape
• Check whether a net folds up into a cube

You should already know

• Angles and shapes: acute, obtuse and reflex angles, and angles on a line and at a point (Year 5, Chapter 9)
• Perimeter of rectangles and other shapes (Year 5, Chapter 8; Year 6, Chapter 9)
• Multiplying and dividing decimals (Year 6, Chapter 5)
• Simple equations with one unknown, used for missing angles (Year 6, Chapter 8)

Where this leads

• Coordinates, reflection and translation of shapes (Year 6, Chapter 11)
• Circle area, and angles in parallel lines and circles (KS3)
• Using angle facts to prove geometric results (KS3)