One of the angles formed at the intersection of two straight lines is 210 degrees. find these corners.

In order to find the degree measure of all angles formed at the intersection of straight lines, recall the types of angles formed at the intersection of two straight lines and their properties.

When two straight lines intersect, two pairs of vertical angles are formed. The vertical angles are equal to each other.

Adjacent corners are also formed. Their degree measures are usually different. The sum of adjacent angles is 180 °.

In our case, we are talking about just adjacent corners.

Let us denote one of them by x, and the second is known from condition 21 °;

x + 21 = 180;

x = 180 – 21;

x = 159 °.

Answer: 21 °; 159 °; 21 °.