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Yakvenalex [24]
4 years ago
12

Knowing that sin 30 = 1/2 what is a

Mathematics
2 answers:
Aleksandr [31]4 years ago
6 0

Answer:

B. 18  

Step-by-step explanation:

We have been given a diagram of a right triangle and we are asked to find the value of a.

Since we know that Sine relates the opposite with hypotenuse of a right triangle.  

\text{sin}=\frac{\text{Opposite}}{\text{Hypotenuse}}

Upon substituting our given values we will get,

sin(30^o)=\frac{9}{a}

Upon substituting sin(30^o)=\frac{1}{2} in above equation we will get,

\frac{1}{2}=\frac{9}{a}

Now let us cross multiply our equation to solve for a.

1\cdot a=9\cdot 2

a=18

Therefore, the value of a is 18 and option B is the correct choice.

natulia [17]4 years ago
4 0

sin30^o=\frac{9}{a}\\\frac{9}{a}=\frac{1}{2}\\a=2\cdot9\\a=18

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