oganesbagoyan

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2) a₆ = 2r*tqα/2 =2r*tqπ/6 =2*42√3*1/√3 =84.
3) S =p*r ⇒p =S/r =70/5 =14.
P =2*p =2*14 =28.
5)  h =2r =2*16,5 =33;
a = 2h =2*33 =66. (катет  h против угла 30° : h =a/2)