help pls

[leaden tusk]

11. those are vertical angles and are equal

for 3x+1 = 112

[silver granite]

10. The sum of the angles that lie on the same line is 180 degrees (supplementary angles)

9. Using the angle addition postulate, 3x and 19 add up to be 90 degrees

[leaden tusk]

12. you find the area of the rectangle and then the semi circle and add them together

[errant frost]

.solved #help-13 message