Deduction triangle area
Cabri 1) Construct a rectangle inside a triangle whose base is equal to the base of the rectangle and the top part of the opposite side of the rectangle as shown in the figure below:
2) Calculate the area of \u200b\u200bboth figures and compare the results.
3) Move the vertex of the triangle as shown in the following figure and compare the areas.
is noted that the area of \u200b\u200bthe triangle is always half the area of \u200b\u200bthe rectangle so:
AREA OF TRIANGLE = base x height / 2
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