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The altitude/height of an equilateral triangle can be calculated by taking the perpendicular bisector of any side. This line will bisect its opposite angle forming two congruent right angled triangles.

The side length of the original equilateral triangle is the hypotenuse and the short leg of right angled triangle is half the hypotenuse.

By Pythagoras' Theorem : 42 = 22 + L2.........where L is the length of the altitude.

L2 = 42 - 22 = 16 - 4 = 12

L = √12 = 2√3 = 3.464 (3dp)

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Q: What is the length of the altitude of an equilateral triangle whose side has a length of four?
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