Question

If Sin A =4/5, then Cos A =?​

Answer 1

Answer:

3/5

Step-by-step explanation:

Since,

Sin A =4/5

then as we know,

and since its perpendicular by base, we can see that Perpendicular is 4 and base is 5.

So,

similarly,

Cos= p/b

so,

since perpendicular is with us and hypotenuse,

we calculate the Base, by the help of Pythagoras theorem.

So,

p²+b²=h²

=> 4²+b²=5²

=> b²=25-16

=>b=√9

=> b=3 units.

And,

Cos= b/h

so,

using this!

Cos= 3/5

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