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7) x=60 degrees

8) x= 118 degrees

9) x= 65 degrees

10) x= 77.5 degrees

11) x= 45 degrees

12) x= 60 degrees

Step-by-step explanation:

12.) a whole triangle reguardless adds up to 180degrees. so just divide 180/3 you get 60.

11.) you know a right angle is 90 degrees. so subtract 180-90 = 90 degrees. divide 90 by 2 you get 45 degrees. To check your work you can do 2*45 you get 90 then add the 90 degree right angle to it you get a full 180 degrees.

10.) you subtract 180-25 you get 155 degrees. Then divide 155/2 you get 77.5. You can check your work by multiplying 77.5 by 2 you get 155 degrees and add the 25 degrees we were given and you get a full 180.

9.) You can add the two angles that are given which are 65 and 50. Which would be 65+50= 115. Then subtract 180-115 and you get 65 degrees. To check your work add 65+65+50. you should get 180

To check your work just add all of the angles and if you get a total of 180 you know you got it right.

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