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sdas [7]
2 years ago
12

the perimeter of an equilateral triangle is 39 centimeters. What is the length of an altitude of the triangle ?​

Mathematics
1 answer:
victus00 [196]2 years ago
8 0

Answer: h = 11.26cm

Step-by-step explanation:

Equilateral triangle has equal sides, let the side be xcm , then the perimeter is 3x

Therefore:

3x = 39

x = 39/3

x = 13cm

To find the altitude , we will apply Pythagoras theorem , that is

13^{2}=h^{2}+6.5^{2}

Therefore:

h^{2}=13^{2}-6.5^{2}

h^{2}=169-42.25

h^{2}=126.75

take the square root of both sides

h = 11.26cm

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Answer:

<em>x = 59</em>

Step-by-step explanation:

<u>Equations</u>

The interior angles formed by the sides of a quadrilateral have measures that sum to 360°.

The image shows a four-sided polygon and its four angles measures, thus we sum them all and equate the sum to 360:

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