# Excel ASIN Function

Summary

The Excel ASIN function returns the arcsin of a number.

Purpose

Get the angle of a triangle.

Return value

Angle in Radians

Syntax

=ASIN (number)

Arguments

**number**- The ratio of the opposite-side over the hypotenuse of a right-triangle.

Usage notes

ARCSIN expects an input between -1 and 1, where the input is a ratio of the opposite-side over the hypotenuse of a right triangle.

θ = ASIN(opposite/adjacent) // Where θ is the angle

### Inverse

ARCSIN( ratio) is the inverse of SIN(angle)

= angle = ARCSIN( SIN(angle))

### Return Type

To convert from radians to degrees multiply by 180/pi() or use the DEGREES function.

= angle * 180/PI()

= DEGREES( angle)

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