Given a rectangle the length of 5cm and the width of 3cm. Find the area of this rectangle.
The picture below shows the rectangle with the length of 5cm and the width of 3cm.
To calculate the area, we can use the formula for the area of a rectangle:
Since the length is given as 5cm, we can substitute l with 5. Similarly, since the width is given as 3cm, we can substitute w with 3. After doing so, we can calculate for A, as shown below:
Now, the calculated number 15 only has a meaning if we include the unit for it. Since the given length and width are in cm, the unit for area will be cm2. Hence:
Clearly, the answer is B.
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