Hello, struck!

An equilateral triangle with sides of 8cm length each,

is inscribed in a circle. Calculate the diameter of the circle. Code:

A
* * *
* /|\ *
* / | \ *
* / | \ *
/ | \ 8
* / | \ *
* / O* r \ *
* / | * \ *
/ | * \
B*- - - - + - - - -*C
* D 4 *
* *
* * *

Equilateral

It is inscribed in circle with radius

In right triangle

The medians, altitudes and angle bisectors intersect at ,

. . the centroid, which divides the altitude in the ratio 1:2.

Hence: .

In right triangle

[Remember: they asked for the *diameter*.]