作业帮Find the Area 找面积
来源：学生作业帮 编辑：作业帮 分类：数学作业 时间：2024/11/09 04:42:32
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？
Find the Area 找面积
用积分求面积的一题 Find the surface area of the plane
Find the area of the given figure.翻译
英语翻译find the dimensions of the rectangle with greatest area
the area of怎么用?翻译中国领土面积960万平方千米,用上the area of
美国数学竞赛题1.Find the area of the region that lies under the gra
Find the area of the region bounded by the ellipse whose equ
英语翻译1．According to the data,find the total area of Hong Kong
The area of rectangle is 192c㎡.If the length is12cm,find it'
英语翻译Find the circumference of a circular disk whose area is
英语翻译Find the area of a rectangular room measuring 8.7m by 14
1.the area of a stage in square shape is 676 m2.find its len