Equation : (7x-4)+(3x-3)+(x) = 180 In the equation the sum of the internal angle in the triangle is 180 degrees. Use this equation to figure the sum of angle in any quadrilateral 180*(number of sides-2) Solve the equation Put all similar variable on one side 7x+3x+x-4-3=180 11x-7=180 11x=180+7 11x=187 x = 187/11 x = 17 Now find the angles by plugging in x Angle F (7*17-4) = 115 degrees Angle G (x) = 17 degrees Angle E (3*17-3) = 48 degrees If you add 115+48+17 you will get a sum of 180 this shows your answer is right
