You need to measure how wide it is and the height of the triangle then multiply them together and the you get your answere.
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To find the area of a triangle find the base and the height of the triangle. Then multiply the base by the height, then divide by 2. To find the perimiter of a triangle add together the outside edge of the triangle. To find the area of a triangle find the base and the height of the triangle. Then multiply the base by the height, then divide by 2. To find the perimiter of a triangle add together the outside edge of the triangle.
Find the area of the triangle 4inch tall 3.2 base
You find the height by using Pythagoras' theorem and then 0.5*base*height = area.
Area = 0.5*Base*Height
Area of a triangle = 0.5*base*perpendicular height