∠a is an acute angle in a right triangle. given that cosa=1213, what is the ratio for sina? enter your answer in the boxes as a fraction in simplest form.

is the answer.

Step-by-step explanation:

It is given that in a right angle triangle angle B is a right angle triangle and

Now we see in the figure attached Base(adjacent side) is 12 and hypotenuse is 13.

We have to find sina.

since

We will find the length of hypotenuse with the help of Pythagoras theorem.

BC = √(13²-12²) = √(169-144) = √25 = 5

Now from the given triangle

The correct option is

5/13

Step-by-step explanation: Just confirming the answer :)

step-by-step explanation:

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jml angle lkj & angle mj = lm