Answer:
3. x = 40.75°
4. 8
Step-by-step explanation:
3. the sum of the interior angles in a triangle is 180°
so
x + x + 98.5 = 180
to find x:
x + x + 98.5 = 180
2x = 180 - 98.5
2x = 81.5
x = 81.5/2
x = 40.75
4. in the in isosceles triangle the base angles are equal
so
3x + 4 = x + 8
to find x:
3x + 4 = x + 8
3x - x = 8 - 4
2x = 4
x = 4/2
x = 2
so the length of the base is 2*2 + 4 = 8
