work out the perimeter of this semicircle the radius is 11cm take π to be 3.142 and write down all of the digits given by your calculator

Here is the pic I made.

Step-by-step explanation:

Hope it helped!

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

is the anwser b. (-13)?