一般求S平行四邊形用底邊乘以對(duì)應(yīng)邊上的高,當(dāng)若已知兩邊及夾角時(shí),S平行四邊形=absinθ,實(shí)質(zhì)也是底乘高.fOt影風(fēng)網(wǎng)
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