As the sum of the interior angles of a triangle equals 180°, we can build the following relation:

Replacing the expressions given:

Simplifying the equation we get:

Then, to get the value of each angle we have to substitute this value in each expression given.
• m∠K

• m∠L

• m∠M

Answer:
• Equation

• m∠K = 28°
,
• m∠L = 89°
,
• m∠M = 63°