Sum of angles

• x: By angles on a line, $x = 180-58=122$
• y+z: Similarly by angles on a line, $y + z =180$
• Hence $x+y+z = 122 + 180 =302$

Note: We can show that $\angle y = 58 ^ \circ$ and $\angle z = 122 ^ \circ$ .

Since these two lines are horizontal, the total degrees are 360, so, x+y+z=360-58=302.

x + 58 = 180

x = 180 - 58 = 122

y + z = 180

x + y + z = 180 + 122 = 302