OK so it is not as hard as it seems if you add all the angles inside of one triangleit will always be 180 if you did it right and if you and 2 conecting triangs side by side if they are a stright line you would also get 180 ..and if it is not a triangle and it is some type of quadralateral, meaning a shape with 4 sides, you should always add up to 360
For example where you got 50 degrees all you had to do was add up your givin angles and subtract it by 180 since it is a triangle and that would give you 50 if you have any more questions on this just ask
I think the volume of the cone is 65.94yd because the radius is 3 and the height is 7 also 3 to the second power equals 9 then 3.14 multiplied by 9 equals 28.26 and finally 28.26 multiplied by 7/3 equals 65.94
