Triangle angles add to 180 degrees.
25+30=55 degrees, so x=180-55=125 degrees and y=180-x=55 degrees.
Answer:
x = 125
Step-by-step explanation:
y = 25 + 30 { exterior angle equals the sum of opposite interior angles }
y = 55
x + y =180 { linear pair }
x + 55 = 180
x = 180 -55
