The rectangle is less than 8.5 cm long and less than 4.3 cm wide. Prove that the perimeter is less than 25.6 cm?
| September 23, 2021 | education
The perimeter of a rectangle is easy to find using the formula: 2 * (a + b), where a and b are its width and length. From the conditions of the problem, we obtain two inequalities:
a <8.5;
b <4.3.
Adding them up we get:
a + b <12.8.
Multiplying by 2 we get:
2 * (a + b) <25.6.
Q.E.D.
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