“SSA” means side, side, angle.
“SSA” is used when two sides and one angle of a triangle are given and we want to find the missing side angles. Consider the triangle 
with the side 
, 
and 
and angle 
, 
and 
.We can observe that we are given the three sides , and one angle. Therefore the figure illustrates a triangle combination which is known as a SSA triangle.
Step 1: Calculate the largest angle by using the Law of Cosine.
Step 2: To find the second angle by using the Law of Cosine.
Step 3: To find the third by using the angle sum rule of a triangle.
Here we use the Law of sine. The Law of sine is
In the sides of triangle is , and and angle , and the law of sines is
