Geometrical terms

1 Recognize and understand the following geometrical terms: point, vertex, line, parallel, perpendicular, bearing, right angle, acute, obtuse, reflex angles, interior and exterior angles, similar, congruent, and scale factor. 2 Understand and use the vocabulary related to: Triangles (equilateral, isosceles, scalene, right-angled), special quadrilaterals (square, rectangle, kite, rhombus, parallelogram, trapezium), polygons (regular and irregular polygons, pentagon, hexagon, octagon, decagon), and simple solids (cube, cuboid, prism, cylinder, pyramid, cone, sphere; the term 'hemisphere' is not required). 3 Understand and use the vocabulary associated with circles, including centre, radius (plural: radii), diameter, circumference, semicircle, chord, tangent, arc, sector, and segment.