eq. of any line ⊥ to y=-2 is
x=k, where k is a real number.
it may be y-axis or any line ║ to y-axis.
Perpendicular lines are two lines that form two 90 degree angles. Since y = -2 is a horizontal line, any line written as, for example, x = -2 or x = 20 would be perpendicular. This is because if you only set x equal to a value, it creates a vertical line.
the measure of the exterior angle a is the sum of the opposite angles inside the triangle.
angle a = 90+ 32
check the picture below.
make sure your calculator is in degree mode.