Answer:
The actual length of the wall is 10.5 m
Step-by-step explanation:
Write and solve an equation of ratios to answer this question:
2 cm 3 m
--------- = ---------
7 cm L
Solve this for L by inverting both sides:
7cm L
---------- = --------
2 cm 3 m
and then multiplying both sides by 3m:
21
----- = L
2
The actual length of the wall is 10.5 m
First 2 are true and others are false
The measure of an exterior angle in a polygon with n sides is given by:

So, for n = 20, we have the measure of the exterior angles of the polygon with 20 sides:

Now, to find the sum of all exterior angles, let's multiply the exterior angles by the number of sides of the polygon:

Therefore the sum is equal to 360°, correct option: B.
(The sum of exterior angles of a polygon with n sides is always equal to 360°)
I think the pattern is
++_0_--
i.e positive twice neutral negative twice
2010
0.00 and 2012
-0.45