Answer:
37°
Step-by-step explanation:
We have been given the diagram of the triangle;
To find the angle I;
We need to apply one of the geometry laws,
The sum of adjacent internal angles of a triangle gives the external angle;
So;
I + 115 = 152
Solve for I;
I = 152 - 115 = 37°
Okay. This is a little tricky because your question isn't quite as clear as I would like it to be, but I can work with it nevertheless. I am going to assume that you are asking how many tenths you would get when you add 0.12 and 0.9, which are the equivalent to 12 tenths and 9 tenths. The answer to this would be 0.21, or 21 tenths, or if you want to get really technical and use the absolute correct term, 21 hundredths. If this answer was not clear, please ask! Happy home-working!
Please plot these 3 points on graph paper. This will result in a triangle with three different vertices. Which vertex corresponds to the largest interior angle of the triangle? to the smallest? If you can answer these questions properly, then you'll pretty much have the answer to this question. Be sure to arrange the sizes of the angles in ascending (increasing) order.