By Angle sum property,
Sum of all angles of a triangle equal to 180°.
As per the property,
A+B+C = 180°
4x-13 + 15 + x+18 = 180
5x+20 = 180
5x = 160
x = 32
Measure of Angle A =>
4x-13 = 4*32-13 = 128-13 = 115°
Measure of Angle C =>
x+18 = 32+18 = 50°
!! Hope It Helps !!
