In right triangle abc, angle a and angle b are complementary angles. the value of cos a is 5/13. what is the value of sin b.

cos is . So, if cos(a)= then use Pythagorean Theorem to determine the length of the "opposite" side.

5² + x² = 13²

25 + x² = 169

      x² = 144

       x = 12

Now that you know the length of the opposite side, you can plug it in for sin.

sin is . So, sin(a) =

Now, if you switch so you are looking for sin(b), the cos and sin also switch.

cos(b) = sin(a) =

sin(b) = cos(a) =

sin(b) =

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step-by-step explanation:

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%