[數學]小小幾何題
由 aa2191943 於 星期一 七月 24, 2006 5:58 pm
#ed_op#DIV#ed_cl##ed_op#DIV#ed_cl#有一平行四邊形,邊長分別為x, y, x, y#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#若兩對角線夾角#ed_op#EM#ed_cl#θ#ed_op#/EM#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#且該四邊形的任意內角為α#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#試問:#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl# (1)該平行四邊形面積?#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl# (2)sin α =?#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#(註: 以x, y, #ed_op#EM#ed_cl#θ#ed_op#/EM#ed_cl#作答)#ed_op#/DIV#ed_cl##ed_op#/DIV#ed_cl#