The triangle's height is 20 cm long the diameter of the circle is 28 cm long what is the triangle perimeter?

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so i am curious is it too hard or the question went wrong
If it is an equilateral triangle, it must have a specific height. So it is not impossible to find it but now what is the formula to use for this
maybe pythagoras theorem?
or sin cos tan?
It is pythagoras theorem

Jawapan

2016-05-09T23:20:19+08:00

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Let's say the length of each sides of the equilateral triangle is y.

20² = x² - (×/2)²
400 = x² - (x²/4)
1600 = 4x² - x²
1600 = 3x²
16300/3 = x²
x = √(1600/3)
x = 23cm