The Cosine Formula 2 Wall Chart is a comprehensive mathematics learning resource designed to help students understand and apply the cosine rule when solving non right angled triangles. This educational wall chart presents a complete worked example that guides learners through each stage of the calculation, making it an excellent classroom reference and revision aid. The clear layout, colour coded labels, and step by step explanations make complex trigonometric calculations easier to follow. This mathematics poster is ideal for secondary schools, tutoring centres, and students preparing for examinations.

The wall chart begins with a clearly labelled triangle showing sides and angles using standard mathematical notation. Known values are identified, including side b = 8, side c = 6, and angle A = 70°, while the unknown side and angles are highlighted for calculation. This visual representation helps learners understand how to identify the given information before applying the cosine formula.

Step 1 demonstrates how to calculate the missing side using the cosine rule, with every substitution and calculation shown in detail. The example illustrates how the formula is rearranged, values are substituted correctly, intermediate calculations are performed, and the final side length is obtained. Step 2 then uses the calculated side to determine another unknown angle by applying the cosine formula again. The worked solution explains each stage from substitution through to finding the inverse cosine value. Finally, Step 3 demonstrates how to calculate the remaining angle by using the fact that the interior angles of a triangle add up to 180 degrees.

This high quality educational poster reinforces important trigonometry skills including formula application, mathematical reasoning, problem solving, and accurate calculation techniques. It is an excellent teaching aid for Mathematics classrooms, study groups, homeschooling environments, and independent revision. Displaying the chart provides students with a quick reference that builds confidence when solving examination style questions involving the cosine rule.