Circumference of the circle with the radius 10mm? Use pi 3.14

Me! #1 write an equation for the interior angles of this triangle that uses the triangle sum theorem. #2 what is the value of x? #3 what is the measure of #4 classify the triangle above as acute, obtuse, or right. state your reason in a complete sentence.

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Can any one me with the answers to these questions asap?