<h3>The true statement about circumference of a circle is: circumference is found by multiplying Pi by the diameter</h3>
<em><u>Solution:</u></em>
<em><u>The circumference of a circle is given as:</u></em>

Where,
"r" is the radius of circle
We know that,

<em><u>Thus the circumference can also written as:</u></em>

Thus, the circumference is found by multiplying Pi by the diameter is correct statement
1, 2, 3, 5, 6, 10, 15, 30
The answer may be 28.274333882308, but there were no choices given, so I don't know.
Theoretical would be approximately 26.67
Experimental is 0.24 (24%)