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Height of Equilateral Triangle: Definition and Examples | EDU.COMEDU.COMResourcesBlogGuidePodcastPlanBackHomesvg]:size-3.5">Math Glossarysvg]:size-3.5">Height of Equilateral TriangleHeight of Equilateral Triangle: Definition and ExamplesTable of ContentsHeight of Equilateral Triangle Definition of Height in Equilateral Triangles

Height of an equilateral triangle is the length measured from its top vertex to the base. In an equilateral triangle, which has all three sides equal in length, the height is a straight line drawn from one vertex to the opposite side. This line divides the triangle into two parts of equal area. The height is perpendicular to the base and forms a 90-degree angle with it.

The height of an equilateral triangle has several important characteristics. It acts as an angle bisector, dividing the angle at the vertex into two equal parts. Additionally, the height divides the opposite side into two equal segments, making it a perpendicular bisector of that side. In an equilateral triangle, all three heights are equal in length because all sides are equal.

Equilateral Triangles

Formula for Finding the Height of an Equilateral Triangle

The formula for calculating the height (h) of an equilateral triangle with side length (a) is:

h=32ah = \frac{\sqrt{3}}{2}ah=23​​a

This formula is derived using the Pythagorean theorem. When we draw the height from one vertex to the opposite side, it creates a right-angled triangle. The height represents the perpendicular distance, while half the side length forms the base of this right-angled triangle. Using these values in the Pythagorean theorem leads to the formula above.

Examples of Finding Height in Equilateral Triangles Example 1: Finding Height When Side Length is Given Problem:

Find the height of an equilateral triangle if its side is 5 units.

Height in Equilateral Triangles

Step-by-step solution:

Step 1, Identify what we know. The side of the equilateral triangle is a=5a = 5a=5 units.

Step 2, Recall the formula for height of an equilateral triangle. The height formula is h=32ah = \frac{\sqrt{3}}{2}ah=23​​a.

Step 3, Substitute the side length into the formula. h=32×5 unitsh = \frac{\sqrt{3}}{2} \times 5\text{ units}h=23​​×5 units

Step 4, Calculate the height.

h=3×52 unitsh = \frac{\sqrt{3} \times 5}{2}\text{ units}h=23​×5​ units h=532 units≈4.33 unitsh = \frac{5\sqrt{3}}{2}\text{ units} \approx 4.33\text{ units}h=253​​ units≈4.33 units

Therefore, the height of an equilateral triangle with side length 5 units is approximately 4.33 units.

Example 2: Finding Height When Perimeter is Given Problem:

Find the height of an equilateral triangle if its perimeter is 12312\sqrt{3}123​ units.

Height in Equilateral Triangles

Step-by-step solution:

Step 1, Find the side length from the perimeter. Since perimeter = 3a, we can write:

3a=123 units3a = 12\sqrt{3}\text{ units}3a=123​ units a=1233 units=43 unitsa = \frac{12\sqrt{3}}{3}\text{ units} = 4\sqrt{3}\text{ units}a=3123​​ units=43​ units

Step 2, Use the formula to find the height:

h=32ah = \frac{\sqrt{3}}{2}ah=23​​a h=32×43 unitsh = \frac{\sqrt{3}}{2} \times 4\sqrt{3}\text{ units}h=23​​×43​ units

Step 3, Simplify the expression:

h=3×432 unitsh = \frac{\sqrt{3} \times 4\sqrt{3}}{2}\text{ units}h=23​×43​​ units h=4×32 unitsh = \frac{4 \times 3}{2}\text{ units}h=24×3​ units h=6 unitsh = 6\text{ units}h=6 units

Therefore, the height of an equilateral triangle with perimeter 12312\sqrt{3}123​ units is 6 units.

Example 3: Finding Height When Area is Given Problem:

Find the height of an equilateral triangle if its Area is 434\sqrt{3}43​ square units.

Height in Equilateral Triangles

Step-by-step solution:

Step 1, Find the side length using the area formula. We know that: Area=34(a)2=43 square units\text{Area} = \frac{\sqrt{3}}{4}(a)^{2} = 4\sqrt{3}\text{ square units}Area=43​​(a)2=43​ square units

Step 2, Solve for the side length:

34(a)2=43 square units\frac{\sqrt{3}}{4}(a)^{2} = 4\sqrt{3}\text{ square units}43​​(a)2=43​ square units (a)2=43×43 square units(a)^{2} = \frac{4\sqrt{3} \times 4}{\sqrt{3}}\text{ square units}(a)2=3​43​×4​ square units (a)2=16 square units(a)^{2} = 16\text{ square units}(a)2=16 square units a=4 unitsa = 4\text{ units}a=4 units

Step 3, Calculate the height using the formula:

h=32ah = \frac{\sqrt{3}}{2}ah=23​​a h=32×4 unitsh = \frac{\sqrt{3}}{2} \times 4\text{ units}h=23​​×4 units h=23 unitsh = 2\sqrt{3}\text{ units}h=23​ units

Therefore, the height of an equilateral triangle with area 434\sqrt{3}43​ square units is 232\sqrt{3}23​ units.

Comments(1)AAdventureSeekerSeptember 17, 2025I used the height formula from this page to help my kids with their geometry homework, and it was a game-changer! The examples made it so easy to explain. Thanks for breaking it down!

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