Cos 77 Degrees
Sin, Cos, Tan, Cot of an Angle
What is cos 77°?
Answer
cos 77° ≈
0.2250
Angle in radians: 77° = 77π/180. The point of the angle is in quadrant I, where cosine is positive.
≈ — rounded to 4 decimal places. cos 77° can't be written with square roots: 77° is not a multiple of 3°.
P(cos 77°, sin 77°) ≈ (0.2250, 0.9744)
P(cos 77°, sin 77°) ≈ (0.2250, 0.9744)
Highlighted: the projection on the x-axis — cosine, x ≈ 0.2250.
See Also
- Arcsin, Arccos, Arctan, Arccot - The angle from the value of its sine, cosine, tangent or cotangent: exact in degrees and π, with the check and the unit circle
- Square Root Calculator - Calculate the square root of any number
- Simplify Square Root Calculator - Write any square root in simplest radical form, step by step
- Geometry Formulas: Area, Volume, Perimeter - The formula for every standard shape, where it comes from, and worked examples
Cosine of nearby angles
FAQ
What is cos 77°?
cos 77° ≈ 0.2250
Why does cos 77° have no exact value?
A trigonometric value of a whole number of degrees can be written with square roots only when the angle is a multiple of 3°. 77° is not, so no such exact form exists; the value is used as a decimal: cos 77° ≈ 0.2250.
Why does a calculator show −0.0310 for cos 77?
The calculator is in radian mode (RAD): it takes cos 77 as the cosine of 77 radians, cos 77 rad ≈ −0.0310. Switch it to degrees (DEG): cos 77° ≈ 0.2250. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.
See Also
- Cos 67 Degrees: Cosine of 67° on the Unit Circle
- Cos 68 Degrees: Cosine of 68° on the Unit Circle
- Cos 69 Degrees: Cosine of 69° on the Unit Circle
- Cos 70 Degrees: Cosine of 70° on the Unit Circle
- Cos 71 Degrees: Cosine of 71° on the Unit Circle
- Cos 72 Degrees: Cosine of 72° on the Unit Circle
- Cos 73 Degrees: Cosine of 73° on the Unit Circle
- Cos 74 Degrees: Cosine of 74° on the Unit Circle
- Cos 75 Degrees: Cosine of 75° on the Unit Circle
- Cos 76 Degrees: Cosine of 76° on the Unit Circle
- Cos 78 Degrees: Cosine of 78° on the Unit Circle
- Cos 79 Degrees: Cosine of 79° on the Unit Circle
- Cos 80 Degrees: Cosine of 80° on the Unit Circle
- Cos 81 Degrees: Cosine of 81° on the Unit Circle
- Cos 82 Degrees: Cosine of 82° on the Unit Circle
- Cos 83 Degrees: Cosine of 83° on the Unit Circle
- Cos 84 Degrees: Cosine of 84° on the Unit Circle
- Cos 85 Degrees: Cosine of 85° on the Unit Circle
- Cos 86 Degrees: Cosine of 86° on the Unit Circle
- Cos 87 Degrees: Cosine of 87° on the Unit Circle
- Косинус 77 градусов (cos 77°) на единичной окружности
- Coseno de 77 grados (cos 77°) en el círculo unitario
- Cosseno de 77 graus (cos 77°) no ciclo trigonométrico