Csc means cosecant and it is the ratio of the hypotenuse / opposite. With angle B, the hypotenuse = 10 and the opposite side = 6. So, the cosecant of Angle B = 10 / 6 = 1.6666666... To see all the trigonometric ratios, click here: http://www.1728.org/trigcalc.htm
We will use the ratio of tanget which is the opposite over the adjecent The opposite side of angle B is 6 The adjecent side of angle B is 8 Since you are trying to find angles we will use the universe trig functions