Area of a Rectangle Practice

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Question 1
Given a rectangle the length of 5cm and the width of 3cm. Find the area of this rectangle.

Answer

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A. 15 cm
B. 15 cm2
C. 8 cm
D. 8 cm2
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Step by Step Solution 

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Step 1
The picture below shows the rectangle with the length of 5cm and the width of 3cm.
a rectangle with the length 5cm and the width 3cm

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Step 2
To calculate the area, we can use the formula for the area of a rectangle:
formula for the area of a rectangle

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Step 3
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:
Calculating the area of a rectangle
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Step 4
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:
A = 15 cm2
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Step 5
Clearly, the answer is B.

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