Final answer:
To find the area of an obtuse triangle with given side lengths and angle, use the formula 0.5 * l * n * sin(M).
Step-by-step explanation:
To find the area of an obtuse triangle, we need to determine the length of the altitude. Since we are given the lengths of sides l and n, as well as angle M, we can use the formula:
Area = 0.5 * l * n * sin(M)
Plugging in the given values:
Area = 0.5 * 6 * 8.3 * sin(132°)
Calculating the sine of 132°
Area ≈ 0.5 * 6 * 8.3 * 0.9397
Area ≈ 23.21