n-4 x 180
it
Because the 3 interior angles of any triangle add up to 180 degrees.
Yes by bisecting an angle of 140 degrees with a compass
A convex polygon is one with no angle greater than 180 degrees. A non-convex polygon is one that is not without such an angle.
The sum of all the interior angles of any trapezoid is 360 degrees.
Construct an equilateral triangle which will have 3 equal interior angles of 60 degrees and 3 equal exterior angles of 120 degrees
Construct an equilateral triangle because each of its 3 exterior angles measures 120 degrees
use a ruler
540 degrees. you figure it out by seeing how many triangles you can make in the polygon (without crossing lines), and, because triangles equal 180 degrees, you multiply 180 times how many triangles you can make.
You don't always need a protractor to make an angle, just use a normal ruler.
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a protractor