Answer:
670
Step-by-step explanation:
(3*1+2)+(3*2+2)+........(3*20+2)=670
Answer:
144 it is D
Step-by-step explanation:
Answer:
1
Step-by-step explanation:
You can't construct more than 1 triangle. If either of the angles shift, the triangle won't close. And a equilateral triangle must close to be considered, well, a triangle.
Answer:

Step-by-step explanation: