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r²=4
r=√4
r=2
2. h=2r
h=2 * 2
h = 4
3. 4 = a√3/2 /*2
8=a√3 /:√3
a=8/√3
a=8√3/3
4. P=(8√3)²√3/4
P=192√3/4
P=48√3