The sum of the three angles of a convex quadrilateral is 300 degrees. Find the fourth corner.

From the condition, we know that the sum of the three angles of a convex quadrilateral is 300 °. In order to find the fourth corner of a quadrilateral, let us first of all remember what the sum of the angles of any quadrilateral is equal to.

The angles of a quadrilateral add up to 360 °.

The sum of the three angles is known to us. In order to find what the degree measure of the fourth angle is equal to, we must subtract the sum of the three angles of the quadrangle from 360 °.

Let’s calculate the degree measure of the fourth angle:

360 ° – 300 ° = 60 °.

Answer: 60 ° fourth corner.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.