The opposite of 12.1 is 12.2
Answer:
Step-by-step explanation:
1. To find the area of a semicircle the formula is

The square

2. Triangle

Rectangle


3.
Semicircle

Square


Answer:
0
Step-by-step explanation:
You can't construct any triangles with those angles. Because when you add all the angles of a triangle, it has to add up to 180. But when we add 50,70, and 100, it equals 220. So you can't construct any triangles.
Hope this helps.<em> (If it does, please mark me brainliest)</em>