作业帮Find the Area 找面积
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Find the Area 找面积
A rectangular sheet of christmas wrapping paper measures 2.8 m by 50 cm. A triangle with side lengths of 23 cm, 19 cm and 25 cm is cut from the paper. How much paper is left?
A rectangular sheet of christmas wrapping paper measures 2.8 m by 50 cm. A triangle with side lengths of 23 cm, 19 cm and 25 cm is cut from the paper. How much paper is left?
英文水平一般,我的翻译如下：
从一个2.8m长50cm宽的矩形薄片圣诞包装纸上剪裁一个边长23cm,19cm和25cm三角形.有多少纸剩下?
解答如下：
矩形面积=2.8*0.5=1.4m^2
知道了三角形三边长,求三角形面积,运用海伦公式
S=√[p(p-a)(p-b)(p-c)]
而公式里的p为半周长： p=(a+b+c)/2 =(23+10+25)/2=29cm
S=√[p(p-a)(p-b)(p-c)] =√[29(29-23)(29-19)(29-25)] =4√435=83.427cm^2
剩余面积=1.4m^2-83.427cm^2=1.4*10000-83.427=13916.573cm^2
再问： 剩余面积=1.4m^2-83.427cm^2=1.4*10000-83.427=13916.573cm^2 为什么最后1.4要乘 10000？
从一个2.8m长50cm宽的矩形薄片圣诞包装纸上剪裁一个边长23cm,19cm和25cm三角形.有多少纸剩下?
解答如下：
矩形面积=2.8*0.5=1.4m^2
知道了三角形三边长,求三角形面积,运用海伦公式
S=√[p(p-a)(p-b)(p-c)]
而公式里的p为半周长： p=(a+b+c)/2 =(23+10+25)/2=29cm
S=√[p(p-a)(p-b)(p-c)] =√[29(29-23)(29-19)(29-25)] =4√435=83.427cm^2
剩余面积=1.4m^2-83.427cm^2=1.4*10000-83.427=13916.573cm^2
再问： 剩余面积=1.4m^2-83.427cm^2=1.4*10000-83.427=13916.573cm^2 为什么最后1.4要乘 10000？
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