问题
填空题
已知菱形的面积为24cm2,一条对角线长为6cm,则这个菱形的周长是______厘米.
答案
如图所示:
∵菱形的面积等于对角线乘积的一半,AC=6cm,S菱形ABCD=24cm2,
∴BD=8cm,AO=3cm,BO=4cm,
在Rt△ABO中,AB2=AO2+BO2,
即有AB2=32+42,
解得:AB=5cm,
∴菱形的周长=4×5=20cm.
故答案为:20.
已知菱形的面积为24cm2,一条对角线长为6cm,则这个菱形的周长是______厘米.
如图所示:
∵菱形的面积等于对角线乘积的一半,AC=6cm,S菱形ABCD=24cm2,
∴BD=8cm,AO=3cm,BO=4cm,
在Rt△ABO中,AB2=AO2+BO2,
即有AB2=32+42,
解得:AB=5cm,
∴菱形的周长=4×5=20cm.
故答案为:20.
完形填空。 | ||||
Mr. White was holding a party at home to celebrate his sixtieth birthday. To make him happy, one of his women friends 1 to sing a song for him. Now she was singing. One guest turned to a 2 by his side and criticized the singer. "What a 3 voice!" he said. "Do you know 4 she is?" "Yes," was the answer," She is my wife." "Oh, I beg your pardon," the man said. "Of course her voice isn't bad, 5 the song is very bad. I wondered who wrote that awful song?" "I did," was the answer. | ||||
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