the length of a rectangle is 4 cm more than the breadth . if the perimeter of rectangle is 80cm find the area of the rectangle.
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Answer:
Area = L * B
Area = 18 * 22
Area = 396m
I really hope this helps you a lot!
Step-by-step explanation:
First lets look for the length and the breadth.
Breadth;
1. The question tells us that the length is 4cm more than the breadth. So, we can simply make length = ( L + 4)
2. Put it in an equation;
P = 2 ( L + B) OR L + L + B + B
80 = 2 ( (L + 4) + B)
3. Open the brackets
2 ( L + 4 )
80 = (2L + 8) + 2B
4. Group like terms. Move 8 over the equality to meet 80. This changes the sign from + to -
80 - 8 = 2L + 2B
NB: Note that 2L and 2B aren't like terms because their variables are different.
72 = 2L + 2B
5. Also move the coefficient of L and B to meet 7. Also eliminate L because we are looking for B only.
72/4 = B
18m = B
Length;
(B + 4)
18 + 4
L = 22m
Answer:
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