Answer:
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.
