Answer:
13.
Step-by-step explanation:
x+x+5=21
2x+5=21
2x=16
x=8
Answer:

Step-by-step explanation:
<u>Formula for circumference of a circle is</u>:
Circumference = 
<em>Given circumference of the ring is
</em>
<em>Now solving for the radius gives us:</em>

We know that area of a circle is
, substituting the value of r we found, we get the area as:
area (A) = 
Hence the Area (A), in terms of
is
Answer:
give it
Step-by-step explanation:
the answer is m=1/4
Answer:
40
Step-by-step explanation:
30/12=2.5
20/2.5=8
8+8+12+12=40