hi, I am trying to learn trig using Khan acadamy and they are asking questions using symbols that they have not yet explained here is the way they ask it: Given riangle ABC△ABC shown to the left, what is \sin(\angle ABC)sin(∠ABC)?
My question is what is the first triangle mean. I am guessing they are referring to the triangle in the illustration. but then there is that second partial triangle that makes no sense sin then half triangle ABC. totally flustrating me

Question

hi, I am trying to learn trig using Khan acadamy and  they are asking questions using symbols that they have not yet explained here is the way they ask it:   Given 	riangle ABC△ABC shown to the left, what is \sin(\angle ABC)sin(∠ABC)? 
   My question is what is the first triangle mean. I am guessing they are referring to the triangle in the illustration. but then there is that second partial triangle that makes no sense sin then half triangle ABC. totally flustrating me

misty1212 · Answer

HI!!

misty1212 · Answer

a screen shot would help a great deal

anonymous · Answer

here goes

misty1212 · Answer

they are asking for the sine of angle B

anonymous · Answer

is it always the middle letter then? the letters change order sometimes

misty1212 · Answer

instead of saying angle B like normal people they say ABC which means start at A, go to B then go to C
the angle described i would call B

misty1212 · Answer

yeah middle letter

anonymous · Answer

kudos to you misty thanks