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half of base times altitude.
The altitude of a triangle is the distance from the line containing the base to the vertex. Draw the base and continue on outside of the triangle. Measure perpendicular from that line to the vertex.
By using Pythagoras' theorem: hypotenuse^2 minus base^2 = altitude^2
Area of a triangle = 1/2*base*altitude in square units Area = 45 square feet
An isosceles triangle can be considered as two right angle triangles joined together so use the tangent ratio to find its altitude: tan30 degrees = opp/6 (where opp is the altitude and 6 is half the base) 6*tan30 degrees = 3.464101615 units of measurement