The sum of all angles in a triangle is equal to 180.
75 + 70 + 5 + 3x = 180
150 + 3x = 180
3x = 180 - 150
3x = 30
x = 10
Third angle:
5 + 3(10)
35
Answer:
Step-by-step explanation:
The sum of the 3 angles in a triangle = 180°
Sum the 3 given angles and equate to 180, that is
5 + 3x + 70 + 75 = 180
3x + 150 = 180 ( subtract 150 from both sides )
3x = 30 ( divide both sides by 3 )
