Two right angles (90 degrees each) equal 180 degrees (a straight angle).
A trapezoid is a quadrilateral. All quadrilaterals have four angles whose sum is 360 degrees. If two of the angles are right angles, that accounts for 180 degrees of the total. Therefore, the other two angles must total 180 degrees as well.
Supplementary angles total 180 degrees.
SUPPLEMENTARY ANGLES are two angles the sum of whose measures is 180 degrees.
Supplementary angles add up to 180 degrees
Triangles total 180 degrees. Triangles have three angles. Two angles of 90 degrees total 180 degrees.
Two right angles (90 degrees each) equal 180 degrees (a straight angle).
Only when they are supplementary angles
A trapezoid is a quadrilateral. All quadrilaterals have four angles whose sum is 360 degrees. If two of the angles are right angles, that accounts for 180 degrees of the total. Therefore, the other two angles must total 180 degrees as well.
Supplementary angles total 180 degrees.
SUPPLEMENTARY ANGLES are two angles the sum of whose measures is 180 degrees.
Supplementary angles add up to 180 degrees
If two angles of a triangle each measure 45 degrees, the third angle measures 90 degrees. This is because of the Triangle Sum Theorem - The sum of the measure of the interior angles of a triangle is 180 degrees. If you know that two of the angles total to be 90 degrees, you can subtract that 90 degrees from the total 180. The result is 90 degrees.
When two angles add up to 180 degrees, they are supplementary to each other.
Supplementary angles have a sum of 180 degrees.
Supplementary angles add up to 180 degrees
Supplementary