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1,因為ABCD是菱形,所以AD等於AB.因為角A等於60度,所以三角形ABD是等邊三角形.所以菱形的邊長是7cm,所以菱形周長等於7cm乘以4等於28cm .不是說BD等於7cm,角A等於60度嗎,在強調下,是對角線BD等於7cm.如果是長的那就是…
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