Question

one side of an equilateral triangle is 42cm.find the length of an altitude of the triangle.

Answer 1

You can use the Pythagorean Theorem:

a^2 + b^2 = c^2

a^2 + 21^2 = 42^2

a^2 + 441 = 1764

a^2 = 1764 - 441

a^2 = 1323

a = 36.37 cm

Answer 2

that why i asked you