EM-3128

Sine and cosine of obtuse angles

E Math · Secondary 4 · Medium · Sine and cosine of obtuse angles

The sine of an angle is 0.4226.

Give two possible values of the angle, in degrees, between 0° and 360°.

(Give your answers correct to 1 decimal place.)

$25.0^\circ$ or $155.0^\circ$
$25.0^\circ$ or $335.0^\circ$
$65.0^\circ$ or $115.0^\circ$
$205.0^\circ$ or $335.0^\circ$

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