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# AQA A-level Maths Cosine Cosine of an angle is a ratio between the side adjacent to the angle and the hypotenuse of a triangle. Cosine is one of three trigonometric functions of an angle. cos(x) is found by calculating the ratio of two sides of a right-angled triangle, the adjacent and the hypotenuse. The diagram shows a cosine graph. # ✅

Find b if cosA = 0.5 and c = 10.8. # ✅

Find cosA if b = 3.5 cm and c = 14 cm. # ✅

Use your calculator to find the value of cos(0). # ✅

cos(xº) = 1. Given x is an angle in a triangle, what is the value of x? # ✅

Use your calculator to find the value of cos(80º). # ✅

Give the equation / ratio used to find the value of cos(x). # ✅

If x is an angle in a triangle with adjacent = 4 and hypotenuse = 5, what is the value of cos(x)? # ✅

A triangle has hypotenuse 15, opposite 12 and adjacent 9. What is the value of cos x where x is the angle in the triangle, and hence what is the value of x? # ✅

Provide the point at which a cosine graph crosses the y axis. # ✅

Write down the coordinates of point B on the cosine graph.  Have you found the questions useful?