The perimeter of the original rectangle is:
P = 2w + 2l = 70
The area of the original rectangle is:
A = w * l = 250
Then, by modifying the length of its sides we have:
Perimeter:
P '= 2 (2w) +2 (2l)
Rewriting:
P '= 2 (2w + 2l)
P '= 2P
P '= 2 (70)
P '= 140
Area:
A '= (2w) * (2l)
Rewriting:
A '= (2) * (2) (w) * (l)
A '= 4 * w * l
A '= 4 * A
A '= 4 * 250
A '= 1000
Answer:
the new area and the new perimeter are:
P '= 140
A '= 1000
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The answer is 40 because once you have 21 your just adding 19 and then that makes it 40.
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Seek understand, to be understood!
To get the answer we need the formula or source.
The question in another way if 4cm=1.2km, what is the 10cm=--------
first, you have to use the crisscross.
4cm=1.2km
10cm= x it is variable
then, 4xx= 1.2kmx10cm
4x=12km
4x/4= 12/4
x=3km
72÷4=18; 18 is the quotient
