Because in effect a triangle is half of a 4 sided quadrilateral
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i think basexheight and then divide 2
To calculate the area of a triangle - divide the length of the base by 2, then multiply that figure by the height. If the measurements are in centimetres, once you have your area - multiply your figure by 100 and you'll have the area in millimetres.
You first multiply the length and the width, the you divide it by 2.
The formula is A=1/2bh b=base of triangle h=height of triangle A=area 1/2=divide base times height by 2
the formula for area of a triangle is one half base times heightA = 1/2 * base * heightIf you know the area and height, divide the area by 2 times the height.b = a/2h