Question

How to find the value of sin40​

Answer 1

If any angle x is in degree then it is equal to (x×π/180) unit in radian. (a+h)=(37×π/180+3π/180). h=3π/180. @Ujjayanta Bhaumik has given a good solution which gives an idea in which range sin 40 actually lies,But if you want to calculate it's Approximate value by mentally then here is solution .

Answer 2

Answer:

$0.6427$

Step-by-step explanation:

Given: $sin40^{\circ}$

First convert degree into radian.

$\theta$ in radians = $\theta$ in degrees$*(pi/180^\circ)$

So, 40 degrees$=40^\circ* (\pi /180^\circ)$ rad

                         $= \frac{2\pi }{9}\\=0.6981$

So, $sin 40^\circ = sin(0.6981)$

                 $= 0.6427$

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