Calculate Parallelogram Area: Finding Expression with Base 13 and Height 4a

Area Formulas with Variable Expressions

Look at the parallelogram in the figure below.

Express its area in terms of a.

1313134a4a4aAAABBBCCCDDDEEE

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Express the area of the parallelogram using A
00:03 Calculate the area of the parallelogram using height(AE) multiplied by side(DC)
00:10 Substitute appropriate values and solve to find the area
00:19 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Look at the parallelogram in the figure below.

Express its area in terms of a.

1313134a4a4aAAABBBCCCDDDEEE

2

Step-by-step solution

To find the area of the given parallelogram, we apply the formula for the area of a parallelogram, which is:

Area=base×height\text{Area} = \text{base} \times \text{height}

Here, the base is given as 1313 cm and the height is given as 4a4a.

Plugging these values into the formula, we have:

Area=13×4a\text{Area} = 13 \times 4a

Simplifying this, we get:

Area=52a\text{Area} = 52a

Therefore, the area of the parallelogram, expressed in terms of aa, is 52a\boxed{52a} cm².

The correct choice from the given options is therefore choice 3: 52a52a cm².

3

Final Answer

52a 52a cm²

Key Points to Remember

Essential concepts to master this topic
  • Formula: Parallelogram area equals base times height
  • Calculation: Multiply 13 × 4a to get 52a
  • Check: Units remain cm² and variable a stays in expression ✓

Common Mistakes

Avoid these frequent errors
  • Adding base and height instead of multiplying
    Don't add 13 + 4a = (13 + 4a) cm²! This gives a completely wrong formula and incorrect units. Always multiply base × height for parallelogram area.

Practice Quiz

Test your knowledge with interactive questions

Calculate the area of the parallelogram according to the data in the diagram.

101010777AAABBBCCCDDDEEE

FAQ

Everything you need to know about this question

Why don't I need to know the value of 'a' to solve this?

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The question asks for the area in terms of a, meaning your final answer should still contain the variable. You're finding an expression, not a specific number!

How do I know which measurement is the base and which is the height?

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In a parallelogram, the height is always perpendicular to the base. Look for the right angle symbol (small square) in the diagram - that shows the height measurement.

What if I get confused about which sides to use?

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Remember: use the base and height, not just any two sides! The height is the perpendicular distance between parallel sides, shown by the vertical line in the diagram.

Can I simplify 52a any further?

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No, 52a 52a is already in its simplest form. Since 52 and the variable a have no common factors to cancel, this is your final answer.

Why is the answer 52a cm² and not just 52a?

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Always include units in your final answer! Since both measurements were in cm, the area is in cm². The variable a represents a number, so the full answer is 52a cm².

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