For a history fair, a school is building a circular wooden stage that will stand 2 feet off the ground. find the area of the stage if the radius of the stage is 9 feet. use 3.14 for π.

The formula to find the area of a circle is pi times the radius squared. So that is the radius, 9, which will be squared. This equals 81, and you multiply this by pi, 3.14 which equals 254.469.
Answer 254.469 feet cubed

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle