# Find the measures of the angles formed by the intersection of two straight lines, if the sum of the measures

December 29, 2020 | education

| **Find the measures of the angles formed by the intersection of two straight lines, if the sum of the measures of two of these angles is 80 degrees.**

When two straight lines intersect, two pairs of vertical angles are formed, so we find the angles of the first pair:

80˚: 2 = 40˚.

The first angle is 40˚, let’s define the adjacent angle:

180˚ – 40˚ = 140˚.

This means that the angles of the second pair of vertical angles will be equal to 140˚.

Answer: the angles formed by the intersection of two straight lines are equal to 140˚, 40˚, 140˚, 40˚.

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