Answer:
-1050
Step-by-step explanation:
-650+(-400)=-1050
We use negatives to show it is below sea level
A: yes, because the opposite sides are congruent and parallel, it is a parallelogram.
b: yes, because the diagonals bisect each other, it is a parallelogram.
Since 1 cm = 10 mm
Then 4 cm = 40 mm
Take 6.5 divided by 2.75 which equals 2.36, 2.36 times 2.75 equals 6.5
Remember your prefixes! They help a lot, because there is a formula for this particular problem. Nonagon refers to a shape with 9 sides.
The number of triangles a polygon has is represented by the formula:
(n-2)
Where "n" is the number of sides. If you ever forget what you subtract "n" by think of a triangle. It has 3 sides, so it is only logical that you should only have 1 triangle (subtract by 2). So, what is the sum of the interior angles of a triangle, 180°. So the formula looks like this:
Sum of Interior Angles = 180°(n-2)
180°(9-2)
180°(7) = 1260° is the sum of interior angles for a nonagon!
