In a triangle, the 2 outer corners are equal to 100 * and 150 *. Find the value of the third outer corner of the triangle.

Let’s calculate how many degrees the angle of the triangle will equal if we know that the degree value of the external angle is 100 °:

180 – 100 = 80.

Let’s calculate how many degrees the angle of the triangle will be equal to if we know that the degree value of the external angle is 150 °:

180 – 150 = 30.

Let’s calculate how many degrees the third corner of the figure will equal:

180 – 80 – 30 = 70.

Let’s calculate how many degrees the third outer corner of the figure will be equal to:

180 – 70 = 110.

Answer: The outside angle is 110 °: