ASIN()

Syntax. ASIN(number)

Definition. Use the ASIN() function to calculate the adjacent angle based on the sine (see Figure 16-5).

Argument

  • number (required) The sine of the angle; must be between –1 and 1

Background. This function calculates the angle from a sine value. The result is a radian measure and has to be converted into degrees with the DEGREES() function or by multiplying the result by 180/PI().

Because each angle occurs two times in a full circle, the value range for the arcsine is restricted.

  • If the angle is calculated as a radian measure, the value range spans –π/2 to π/2.

  • If the angle is calculated in degrees, the value range spans –90° to 90°.

The values of the arcsine in a coordinate plane look like this:

The ASIN() function.

Figure 16-5. The ASIN() function.

ExampleThe ASIN() function is used to calculate the angles of a right triangle based on the opposite leg and the hypotenuse.

image with no caption

More examples for this function are:

  • =ASIN(1) returns the radian measure 1.570796327 and a 90º angle.

  • =ASIN(0.5) returns the radian measure 0.523598776 and a 150º angle.

  • =ASIN(-0.5) returns the radian measure -0.523598776 and a 210º angle.

See Also

ASINH(), PI(), SIN()

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