解:(1)如图, ······················································2分
(2)与平行且相等.························· 3分 证明:设分别交、于点、. ∵P、关于对称,点在上,∴ 又∵,∴--------------------------------4分 ∵,,∴. ∴四边形是矩形. ∴---------------------------------------------------------------------------6分 ∴P、关于对称, ∵、关于对称, ∴ ∴ ∴---------------------------------------------------------------------------------------8分 |