Re: 小學數學
: 如連結,求救
: 我竟然被一題小五的題目難倒了
: QQ
答案應該是25平方公分
(90-45)/2=22.5(度) 上方直角三角形的左角
90-22.5=67.5(度) 上方直角三角形的右角
(180-45)/2=67.5(度) 中間等腰三角形的上角
180-67.5-67.5=45(度) 右下斜線三角形的下角
左半亦同 所以斜線三角形為45-45-90的等腰直角三角形
三邊比例為1:1:√2
斜邊長為10 所以
10/√2=7.07 等腰直角三角形一邊長(近似值)
7.07*7.07/2=25 斜線三角形的面積
這算法應該算笨的
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※ 編輯: hicker (36.229.223.170), 06/18/2016 09:55:04
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