1. what is the sum of the interior angles of a quadrilateral

a. 720 degrees
b. 540 degrees
c. 360 degrees
d. 180 degrees

2.

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.