Arccos of 0.65

Arcsin, Arccos, Arctan, Arccot
Function
x

What is arccos(0.65)?

Answer

arccos(0.65) ≈
49.4584° ≈ 0.8632 rad

Range: arccos x is an angle from 0° to 180°, so the answer is unique.

≈ — the value is not a table one; rounded to 4 decimal places.

arccos(0.65) is the angle α in [0°, 180°] with cos α = 0.65.

cos 49.4584° ≈ 0.6500

xyOP

α = arccos(0.65) ≈ 49.4584°

P ≈ (0.65, 0.7599)

P lies on the line x = 0.65 in the upper half of the circle, where sin α ≥ 0; highlighted: cos α = 0.65.

All four inverse functions of 0.65
FunctionDegreesRadians
arcsin(0.65)≈ 40.5416°≈ 0.7076
arccos(0.65)≈ 49.4584°≈ 0.8632
arctan(0.65)≈ 33.0239°≈ 0.5764
arccot(0.65)≈ 56.9761°≈ 0.9944

See Also

Recalculate with different values ↑

Arccosine of nearby values

xarccos x
4/7≈ 55.1501°
√3/3≈ 54.7356°
3/5≈ 53.1301°
0.65≈ 49.4584°
2/3≈ 48.1897°
0.7≈ 45.5730°
√2/245° = π/4

FAQ

What is arccos(0.65)?

arccos(0.65) ≈ 49.4584° ≈ 0.8632 rad

How to convert arccos(0.65) to radians?

Multiply the angle in degrees by π/180: 49.4584° × π/180 ≈ 0.8632 rad.

Why does a calculator show 0.8632 for arccos(0.65)?

The calculator is in radian mode (RAD) and gives the angle in radians: arccos(0.65) ≈ 0.8632 rad. In degrees (DEG) it is ≈ 49.4584°.

See Also