Question

If sin a =4/5 then find cosA

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Answer 1

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Sin A =4/5

then as we know,

sin(a) =p / h

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.

Answer 2

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