The area of the rectangle is 24 cm2. Could the perimeter of this rectangle be 24 cm?
May 11, 2021 | education
| Let one side of the rectangle be “a”. And the second side of the rectangle is “b”.
The area of such a rectangle is “a * b” and the perimeter is “2a + 2b”.
Knowing that the area is 24 sq. Cm, we express the “a” side:
a * b = 24;
a = 24 / b. (one)
Knowing that the perimeter is 24 cm, we get:
2a + 2b = 24. (2)
Let us put equation (1) in (2).
2 * 24 / b + 2b = 24;
48 / b + 2b = 24;
Let’s multiply both sides of the equation by “b”:
48 + 2b² = 24b;
2b² – 24b + 48 = 0;
D = 192;
b₁ = 6 + 2√3;
b₂ = 6 – 2√3;
We get 2 options for the rectangle:
1) a₁ = 24 / (6 + 2√3) and b₁ = 6 + 2√3.
2) a₂ = 24 / (6 – 2√3) and b₂ = 6 – 2√3.
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