Question

Help please
im pretty sure this is called angle sum theory but I could be wrong

Answer 1

x= 180°-115°

= 65° ( adjacent angles in a straight line)

y= 180°-90°-65°

= 25° ( angle sum of a triangle)

Answer 2

y = 25

Explanation:

=> 115 = y + 90 {exterior angle of triangle is equal to the sum of its opposite two interior angles}

=> 115 = y + 90

=> 115-90 =y

=> 115 = y + 90

=> 115-90 =y

=> y = 25