Brainliest and 20 points! but, you have to get it right!

Cosine = adjacent / hypotenuse
if cosine B = 255 / 257
then adjacent = 255
and hypotenuse = 257

sine = opposite / hypotenuse
sine (A) = 255 / 257
sine (A) = 0.9922178988 

Looking up the arc sine of  0.9922178988

we find that it is 82.847 Degrees 
Angle A = 82.847 Degrees

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)