The area of a circle is 18 pi square inches. If the area of a sector of this circle is 6 pi square inches, then which of the following must be the sector's central angle?

120°

Step-by-step explanation:

Area of a sector =

theta is the sector's central angle

Area of the sector =

Given area of a circle = 18πin² and area of a sector = 6πin²

On substituting;

6π =

Dividing both sides by 18π we have;

1/3 =

The sector's central angle is 120°

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