12. A trapezoid is a quadrilateral. It has 4 sides
16. Two parallelograms. Two sides opposite of each other will be parallel to each other. The same is true with the other two sides. (length and width)
Four hundred twenty-three billion, ninety million, seven hundred nine thousand
Hope this helped:))
Answer:
Step-by-step explanation:
the angles of a triangle add up to180.
70 plus 30 plus x = 180
100 plus x =180
x=80
