(13x9) / 2
Length times width.
Divide by 2
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Area = 30.549 square units.
If all three sides are 9 inches in length, then it is an EQUILATERAL Triangle. All the angles are 60 degrees.
A triangle can have only three sides. No triangle can have 9 sides!
Triangle B The area of a triangle is the length of the base times the height divided by two. Triangle A has base 13 m and height 5 m so we have (13 * 5) / 2 = 32.5 square meters. Triangle B has base 9 m and height 8 m so we have (9 * 8) /2 = 36 square meters. Therefore Triangle B has the greater area.
The 'included' angle between sides 9 and 8.5 is 106.225 and so the area of the triangle is 0.5*9*8.5*sine(106.225) = 36.727 square cm rounded up to 3 decimal places.