用圆规
五等分圆的尺规作图步骤:1,作以O为圆心的圆,2,作两条垂直相交的直径AB,CD,3,在OA上做垂直平分线并交OA为E,4,以E为圆心,以CE为半径,交AB于F,5,以C为圆心,以CF为半径交圆于P,M,6,以P,M为圆心,CF为半径叫圆于N,H,7,连接C,P,N,H,M即得正五边形.
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