same as a normal one.
base times height. div2
Since they aren't right you will have to draw the height.
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If an equilateral triangle and a square have equal perimeters, then the ratio of the area of the triangle to the area of the square is 1:3.
Perimeter of equilateral triangle: 24 units Area of equilateral triangle: 27.713 square units rounded to three decimal places
Base times height and divided by 2.
8.7
You find the height by using Pythagoras' theorem and then 0.5*base*height = area.