Names of different shapes. Key words - angular sum of triangles, angles, in right angled & isosceles triangles, angles in a square, rectangle, kite etc., sum of angles, properties of 2D shapes, similarities, congruency & symbol, key words - corresponding sides & angles, included angle, included side, hypotenuse, rules, about 2D shapes, properties about circles - radius, diameter, sector, segment, arc, tangent, chord, circumference, transformation - rigid, object, image, translation,