Question

658.Find the sine of a 45-degree angle. Use a calculator only to check your answer.

Answer 1

The sine of a 45-degree angle is 22​​

or approximately 0.7071. You can check this value using a calculator. The reason for this is that in a right triangle with a 45-degree angle, the lengths of the sides are in a ratio of 1:1:2​

, so the sine (opposite/hypotenuse) of the 45-degree angle is 2​1​

or 22​​

.