Maths for A Level Chemistry - updated edition

Geometry You need a knowledge of regular 2D and 3D shapes as well as an appreciation of angles for A-level Chemistry because you need to be able to picture the structure of atoms or molecules and understand the angles involved in structures. 5.1 2D shapes 2D shapes are ϐlat and lie in the plane of the paper (i.e. they can be drawn accurately on a ϐlat piece of paper). Square (4 equal sides) Rectangle (2 pairs of equal sides) Equilateral triangle (all sides are equal and all angles are 60 o ) Right-angled triangle (contains one angle of 90 o ) Isosceles triangle (two equal sides and base angles are equal) Regular pentagon (5 equal sides and angles) Regular hexagon (6 equal sides and angles) Chapter 5 46