In right triangle ABC, ∠A and ∠B are complementary angles and sin A = 89. What is cos B?

Question

welshfella · Answer

there's something wrong with this question. 
the sine of an angle must be between -1 and 1 (89 is definitely not a sine!)
Perhaps its A = 89 ? or sin A = 0.89?

anonymous · Answer

idk why it came out like that it a = 8/9

welshfella · Answer

oh ok 
8/9 makes sense

anonymous · Answer

yeah idk why it came out as 89 when i pasted it

welshfella · Answer

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welshfella · Answer

sin A = opposite side / hypotenuse = 8 /9
cos B  = adjacent side / hypotenuse

What is the adjacent side  for angle B?

welshfella · Answer

note the hypotenuse is the longest (slanting) side

welshfella · Answer

complementary means  <A and <B add up to 90 degrees
that's why i could draw the right angled triangle