Answer:
x= 11
Step-by-step explanation:
=> 8x+5x+37 = 180° { angle sum property }
=> 13x +37 = 180°
=> 13x = 180-37
=> 13x = 143
=> x = 143/13
=> x= 11
x = 11
the sum of the 3 angles in a triangle is 180°
sum the 3 angles and equate to 180
8x + 5x + 37 = 180 , that is
13x + 37 = 180 ( subtract 37 from both sides )
13x = 143 ( divide both sides by 13 )
