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[(a²√3)/4]=4√3 I*4
a²√3=16√3 I: √3
a²=16
a=√16
a=4cm - bok trójkąta równobocznego
h=[a√3] /2 =[4√3]/2=2√3
h=2√3 cm
r=2/3 *h
r=2/3 * 2√3=4/3 *√3 cm
Pk=πr²
Pk=π(4/3 *√3)² = π * 16/9 *3=π* 16/3 = 5 1/3 *π cm²