Change 30 mm to 3 cm because 1 cm = 10mm
SO

and the answer is 27 cm
The answer to your question is A
Here, ∠1 and ∠2 are complementary angles which means they together are forming a right angle or we can also say that their sum is 90°.So, According to this:






<h3>Now, </h3>
<em>Thus, The measure of m∠1 is 6° and measure of m∠2 is 84°...~</em>
18, I believe 360/20 equals 18.