Sin 43 Degrees

Sin, Cos, Tan, Cot of an Angle
Function
Angle (°)

What is sin 43°?

Answer

sin 43° ≈
0.6820

Angle in radians: 43° = 43π/180. The point of the angle is in quadrant I, where sine is positive.

≈ — rounded to 4 decimal places. sin 43° can't be written with square roots: 43° is not a multiple of 3°.

P(cos 43°, sin 43°) ≈ (0.7314, 0.6820)

xyOP

P(cos 43°, sin 43°) ≈ (0.7314, 0.6820)

Highlighted: the projection on the y-axis — sine, y ≈ 0.6820.

All four functions of 43°
FunctionExact valueDecimal
sin 43°—≈ 0.6820
cos 43°—≈ 0.7314
tan 43°—≈ 0.9325
cot 43°—≈ 1.0724

See Also

Recalculate with different values ↑

Sine of nearby angles

Anglesin
40°≈ 0.6428
41°≈ 0.6561
42°≈ 0.6691
43°≈ 0.6820
44°≈ 0.6947
45°√2/2
46°≈ 0.7193

FAQ

What is sin 43°?

sin 43° ≈ 0.6820

Why does sin 43° 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°. 43° is not, so no such exact form exists; the value is used as a decimal: sin 43° ≈ 0.6820.

Why does a calculator show −0.8318 for sin 43?

The calculator is in radian mode (RAD): it takes sin 43 as the sine of 43 radians, sin 43 rad ≈ −0.8318. Switch it to degrees (DEG): sin 43° ≈ 0.6820. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

See Also