Step 1:

The sides of the triangle are and the angle .

Law of cosines: .

Substitute and in above cosine rule.

side .

Law of sines: .

Substitute and in above formula.

In a triangle, total of three angles is .

Substitute  and in above expression.

side and angles and .

Step 2:

The sides of the triangle and angle .

Law of cosines: .

substitute and in above formula.

Side

Step 3:

The two angles of the triangle is and side

In a triangle, total of three angles is .

Substitute  in above expression.

Thus, the third angle .

Law of sines: .

Substitute and in  above formula.

Law of sines: .

Substitute and in above formula.

and

Step 4:

The sides of the triangle are

and .

Law of cosines: .

Substitute and in above formula.

Law of sines: .

Substitute and in above formula.

In a triangle, total of three angles is .

Substitute  and in above expression.

Thus , the three angles of the triangle are , and .