Triangle ABC is an equilateral triangle with side lengths of 10 inches.
What is the length, in INCHES, of AD?

The height AD of the triangle will be equal to 8.66 inches.
It states that in the right angle triangle the hypotenuse square is equal to the sum of the square of the other two sides.
By applying the Pythagorean theorem in the given triangle:-
AB² = BD² + AD²
AD² = AB² - BD²
AD² = 10² - 5²
AD = √(100 - 25 )
AD = 8.66 inches
Therefore the height AD of the triangle will be equal to 8.66 inches.
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