Area of a Triangle Practice

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Question 1

Given a triangle with the base of 3cm and the height of 4cm. Find the area of this triangle.

Answer

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Select and check your answer...

A. 12 cm
B. 12 cm2
C. 6 cm
D. 6 cm2

Step by Step Solution

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    Step 1

    The picture below shows the triangle with the base of 3cm and the height of 4cm.

    a triangle with the base 3cm and height 4cm
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    Step 2

    To calculate the area, we use the formula for the area of a triangle:

    formula for the area of a triangle
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    Step 3

    Since the base is given as 3cm, we can substitute b with 3. Similarly, since the height is given as 4cm, we can substitute h with 3. After doing so, we can calculate for A, as shown below:

    Calculating the area of a triangle
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    Step 4

    Now, the calculated number 6 has no meaning unless we include the unit for it. Since the base is in cm, the unit for the area will be cm2. Hence:

    A = 6 cm2
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    Step 5

    Clearly, the answer is D.