Math Problem Statement

Find the side of an equilateral triangle whose altitude is 14 cm.

Solution

To solve this problem, we can use the relationship between the side length ss of an equilateral triangle and its altitude hh.

For an equilateral triangle, the altitude divides the triangle into two 30-60-90 right triangles. In such a triangle:

  • The altitude hh is related to the side ss by the formula: h=32×sh = \frac{\sqrt{3}}{2} \times s Given that the altitude h=14h = 14 cm, we can solve for ss (the side of the triangle):

14=32×s14 = \frac{\sqrt{3}}{2} \times s

Now, let's solve for ss.The side length of the equilateral triangle is approximately 16.17cm16.17 \, \text{cm}.

Would you like further details or have any questions?

Here are 5 related questions:

  1. What is the area of an equilateral triangle with the same side length?
  2. How do you derive the formula for the altitude of an equilateral triangle?
  3. Can you calculate the perimeter of the triangle given the side length?
  4. How does the altitude relate to the angles in a 30-60-90 triangle?
  5. What is the height of an equilateral triangle with a side length of 10 cm?

Tip: In equilateral triangles, the altitude also bisects the base and the vertex angle, making it a key part of many geometric calculations.

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Math Problem Analysis

Mathematical Concepts

Geometry
Equilateral Triangles
Right Triangles

Formulas

Altitude of an equilateral triangle: h = (√3/2) * s

Theorems

30-60-90 Triangle Theorem

Suitable Grade Level

Grades 8-10