Question

if the three angles of a triangle are 75°,75° and 96° respectively find the fourth angle

Answer 1

triangle have only 3 side not 4 side

Answer 2

sum of all sides of quadrilateral =360

so, angle a+b+c+d =360

120+96+58+d=360

274+d=360

so, d = 360 - 274

d=86

so, fourth angle is 86.