If you do 12 + 9.7 + 12 you will get the perimeter, and to get the area you would use the formula A = x base x height. Since the base is 12 and the height is 9, you would do 12 x 9 x 0.5 to get 54 mm for the area of the triangle.
Wheres the bar graph? if its the one with like 1990- 10% 1997- 11% then no it wouldn't because the numbers are to close for an increment of 5% it should be more like 1%
A given angle measures 90°.. Then, note that the total measurement of the triangle is 180°... Subtract 180° by 90°, and the other angles must add up to 90°!
