The area of ANY triangle is base x height. The height must be measured perpendicular to the base.
In the case of an isosceles triangle, if you know only the length of the sides, you can figure out the height by Pythagoras' Theorem.
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How do you figure out the figure is formed by a square and an isosceles trapezoid what is the area of the figure 7 in wide by 5 inches by 5 inch by 5.5
The formula is: Base times Height divide by two.
All triangles have a total of 180 degrees. In an isosceles triangle the two angles opposite the side of equal length will have equal degrees.
For all triangles: area = 1/2 * base * height
For all triangles: area = 1/2 * base * height
You cannot since there is not sufficient information.