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tumadreeve7852
28.12.2019 •
Mathematics
The width of a rectangle is 6cm less than its length if a parimrter is 80 cm then its length and area are respectively?
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Ответ:
Step-by-step explanation:
Let the length be x cm
Width = x - 6 cm
Perimeter = 80 cm
2 * (length + width ) = 80
2 ( x + x - 6 ) = 80
2x - 6 = 80/2
2x - 6 = 40
2x = 40 +6
2x = 46
x = 46/2
x = 23 cm
Length = 23 cm
Width = x - 6 = 23 - 6 = 17 cm
Area = length * width = 23 * 17 = 391 sq.cm
Ответ:
Step-by-step explanation:
I don't understand