Total measure of the 4 angles of a quadrilateral = 360 degrees
one angle double the other:
x = first angle
2x = second angle
4x = third angle
8x = fourth angle
x + 2x + 4x + 8x = 360 degrees
15x = 360
15x/15 = 360/15
x = 24
x = 24 degrees, first angle
2x = 2(24) = 48 degrees, second angle
4x = 4(24) = 96, degrees, third angle
8x = 8(24) = 192 degrees, fourth angle
To check:
24 + 48 + 96 + 192 = 360 degrees
360 = 360