Sum of all the interior angles = (5-2)x180 = 540°
540 - 100 - 120 - 100 - 90 = 130°
So the last unknown angle in the polygon is 130°
Sum of all the adjacent angles on a straight line is 180°
Angle 1 = 180 - 130 = 50°
10 people because all the sisters have the same brother so 7+1+2.
complementary angles are angles that, when added together, make 90 degrees.
15t+4t+5t=6-30
24t=-24
t=-1
