sin(270°) = -1, exactly −1.
sin(270°) = -1, exactly −1. The angle 270° equals 3π/2 radians (270 × π/180).
Exact form: −1. Decimal: -1 (rounded to 8 places).
270° lies on the negative y-axis. Remember that sine is positive in quadrants I and II, and negative in the others, which decides the sign of the answer.
If you get a different number, the calculator is probably in RAD mode. In radians you would enter 3π/2 instead of 270.
| sin 270° | = -1 |
| cos 270° | = 0 |
| tan 270° | = undefined |
| Angle | Radians | Sin |
|---|---|---|
| 0° | 0 | 0 |
| 30° | π/6 | 0.5 |
| 45° | π/4 | 0.707107 |
| 60° | π/3 | 0.866025 |
| 90° | π/2 | 1 |
| 120° | 2π/3 | 0.866025 |
| 135° | 3π/4 | 0.707107 |
| 150° | 5π/6 | 0.5 |
| 180° | π | 0 |
| 270° | 3π/2 | -1 |
| 360° | 2π | 0 |
sin(270°) = -1, exactly −1.
270° = 3π/2 radians, so sin(270°) = sin(3π/2) = -1.
It is most likely set to radians. Switch to degree (DEG) mode before entering the angle.
Negative.
Yes. Use the calculator on this page, or open the full free Scientific Calculator with memory, history and keyboard support.