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# SQA National 5 Maths Sine Sine of an angle is a ratio between the side opposite to the angle and the hypotenuse of a triangle. Sine is one of three trigonometric functions of an angle. sin(x) is calculated by calculating the ratio of two sides of a right-angled triangle, the opposite and the hypotenuse. The diagram shows a sine graph. # ✅

Find a if sinA = 0.5 and c = 8. # ✅

Find sinB if b = 0.5 m and c = 3 m. # ✅

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

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

Use your calculator to find the value of sin(60º). # ✅

Give the equation / ratio used to find the value of sin x. # ✅

If x is an angle in a triangle with opposite = 3 and hypotenuse = 5, what is the value of sin(x)? # ✅

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

The sine graph crosses the y axis at what point? # ✅

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