Find the measure of each marked angle. In Exercises 11–14, m and n are parallel. See Exa...

Find the measure of each marked angle. In Exercises 11–14, m and n are parallel. See Examples 1 and 2.

(Reference Example 1)

Find the measures of angles 1, 2, 3, and 4 in Figure 15, given that lines m and n are parallel.

(Reference Example 2)

The measures of two of the angles of a triangle are 48° and 61°. See Figure 17. Find the measure of the third angle, x.