Calculate Triangle Area with 2/3 Segment Ratio and Height of 9 Units

Triangle Area with Given Ratio

Since the side BC is 23 \frac{2}{3} side AE.

Calculate the area of the triangle:

999AAABBBCCCEEE

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Calculate the area of the triangle
00:07 BC equals two thirds of AE according to the given data
00:11 Substitute in AE's value in order to determine BC
00:15 Divide 9 by 3 to obtain 3
00:24 Apply the formula to calculate the triangle's area
00:27 (base(BC) x height(AE)) divided by 2
00:32 Substitute in the relevant values and calculate to find the area
00:37 Divide 6 by 2 to obtain 3
00:42 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Since the side BC is 23 \frac{2}{3} side AE.

Calculate the area of the triangle:

999AAABBBCCCEEE

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Calculate the length of side BC using the given ratio.
  • Step 2: Find the area of the triangle using the area formula.
  • Step 3: Verify the solution with the provided choice options.

Now, let's work through each step:

Step 1: Side AE is provided as 9. Since side BC is 23\frac{2}{3} of side AE, we calculate:

BC=23×AE=23×9=6 BC = \frac{2}{3} \times AE = \frac{2}{3} \times 9 = 6

Step 2: Because triangle ABC is involved in calculation, the area of triangle BCE becomes Area=12×BC×height\text{Area} = \frac{1}{2} \times BC \times height, and assumed height perfectly completes these side lengths within the triangle grid. Given no specific height, the functional area equals set simplification calculations:

Substitute the values to find the area of triangle BCE:

Area of BCE=12×BC×AE=12×6×9 \text{Area of } \triangle BCE = \frac{1}{2} \times BC \times AE = \frac{1}{2} \times 6 \times 9

Calculate:

Area=12×54=27 \text{Area} = \frac{1}{2} \times 54 = 27

Therefore, the solution to the problem is 27 27 .

3

Final Answer

27

Key Points to Remember

Essential concepts to master this topic
  • Ratio Interpretation: BC = (2/3) × AE means multiply AE by the fraction
  • Area Formula: Area = (1/2) × base × height = (1/2) × 6 × 9
  • Verification: Check that BC = 6 and Area = 27 matches given answer choices ✓

Common Mistakes

Avoid these frequent errors
  • Using the wrong measurements for base and height
    Don't use BC as height or confuse which sides to multiply = wrong area calculation! The diagram shows AE = 9 is the height (vertical line), not a base. Always identify base and height correctly from the diagram before applying the area formula.

Practice Quiz

Test your knowledge with interactive questions

Angle A is equal to 30°.
Angle B is equal to 60°.
Angle C is equal to 90°.

Can these angles form a triangle?

FAQ

Everything you need to know about this question

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

+

Look at the diagram carefully! The height is always perpendicular to the base. Here, AE = 9 is shown as a vertical line, making it the height. The base BC lies along the bottom.

Why do I multiply AE by 2/3 to get BC?

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The problem states "BC is 23 \frac{2}{3} side AE." This means BC = (2/3) × AE. So BC = (2/3) × 9 = 6.

Can I use any side as the base?

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Technically yes, but you must use the corresponding perpendicular height. It's easiest to use the base shown at the bottom (BC) with the vertical height (AE) from the diagram.

What if I get a different area calculation?

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Double-check your steps: BC = (2/3) × 9 = 6, then Area = (1/2) × 6 × 9 = 27. Make sure you're using the correct formula and measurements!

Why is the answer 27 and not 54?

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Remember the triangle area formula includes (1/2)! If you calculated 6 × 9 = 54, you forgot to divide by 2. The correct area is (1/2) × 54 = 27.

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