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The area of a triangle is half base times height. In this case the area is 20.3x5.6/2 =56.84mm^2
the area equals one half base times height. For example : you have a triangle with a base of 5cm and a height of 6cm you multiply 5 times 6 (=30) then you divide 30 by 2 because its one half of the base times height. Hope that helps :)
The area of a triangle is 1/2 of the base times height. Base x height is 9x8- or 72. Half of 72 is 36. ,
One half its base times its height, or 1/2 b*h.
The area of any triangle is HALF the base times the [vertical] height, so the area of your triangle is: (5 x 10)/2 = 25 (square inches)