If you know a triangle angles add up to 180 degrees, for every side after that is plus 180 degrees. For seven, it is 900 degrees. Add the values then subtract. You get 134.
It is 7 angles which means all the numbers added must =900 so by subtracting we will find our answer 900-(142+140+136+150+148+ a right angle symbol which means 90)=900-716=184
