### Home > INT3 > Chapter 9 > Lesson 9.1.5 > Problem 9-66

9-66.

Calculate each of the following values. Express your answers both exactly and as decimal approximations. Homework Help ✎

sin

sin

Remember that a full circle has 2π radians and a half circle has π radians.

Draw a right triangle and use the special triangle relationship to find the exact value.

Draw a right triangle.

Notice that 60° is your reference angle.

Use the 30°-60°-90° relationship to find the exact value.