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r=2/3h
10cm=2/3h /*3
30cm=2h /:2
h=15cm
h=a√3:2
15cm=a√3:2 /*2
30cm=a√3
a=30cm:√3
a=10√3cm
Obwód 3*10√3cm=30√3cm
r=2/3h
10cm=2/3h /*3
30cm=2h /:2
h=15cm
h=a√3:2
15cm=a√3:2 /*2
30cm=a√3
a=30cm:√3
a=10√3cm
Obwód 3*10√3cm=30√3cm