Well I can’t measure the angles, but you can with a protractor. Then just add those three angles together and if they equal 180, the second answer is yes. And the last problems involve the triangle inequality theorem. If you add the two lesser sides together and they equal less than the third side, they can’t be a triangle. 9+10 is 19 which is less than 22, so it can’t be a triangle. And 7+2 is 9 which still doesn’t work and cannot be a triangle.
