It depends on what information you have.
Three sides,
Two sides and the included angle,
One side and two angles,
One side and perpendicular distance to opposite vertex.
There are other combinations that allow you to derive one or more of the above.
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The most basic method is base times the height, divided by 2.
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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.
Area of a triangle = 0.5*base*perpendicular height
Find the area of the triangle 4inch tall 3.2 base
A= 1/2(b)(h)
Area of a triangle = 1/2*base*height