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How to Construct an Acute Triangle. To construct an acute triangle, simple first construct an angle that is less than 90 degrees and greater than 0 degrees. This will create two sides of your triangle. Then cnstruct a third line intersecting your first two, and you have an acute triangle.
The area of an equilateral triangle = $\frac{\sqrt{3}}{4}$ a, where 2a is the length of the side. Acute Triangles (also called Acute angled triangle): A triangle whose each of the angle measure less than 90 o (acute angle) is called an Acute Triangle. In the above $\Delta ABC$, each of the angles A, B and C are acute.