Area of a Triangle Practice Problems & Step-by-Step Solutions

Master triangle area calculations with interactive practice problems. Learn the formula for all triangle types: equilateral, isosceles, scalene, right, and obtuse triangles.

📚What You'll Practice and Master
  • Apply the Area = (Base × Height) ÷ 2 formula to various triangle types
  • Calculate areas of right triangles using legs as base and height
  • Find missing measurements when given triangle area and one dimension
  • Solve real-world problems involving triangular shapes and tiling
  • Use Heron's formula to find area when all three sides are known
  • Work with obtuse triangles where height extends outside the triangle

Understanding Area of a Triangle

Complete explanation with examples

The Formula For Calculating The Area Of A Triangle

The formula for calculating the area of a triangle of any type:

height times base divided by 2 2 .

Area=Base×Height2 Area=\frac{Base\times Height}{2}

Where:

  • Base = any side of the triangle
  • Height = the perpendicular distance (at 90°) from the opposite vertex to the base line (or its extension).

How to find the area of a triangle:

A3 - the general formula for calculating the area of triangles

Detailed explanation

Practice Area of a Triangle

Test your knowledge with 27 quizzes

Calculate the area of the following triangle:

4.54.54.5777AAABBBCCCEEE

Examples with solutions for Area of a Triangle

Step-by-step solutions included
Exercise #1

Calculate the area of the right triangle below:

101010666888AAACCCBBB

Step-by-Step Solution

Due to the fact that AB is perpendicular to BC and forms a 90-degree angle,

it can be argued that AB is the height of the triangle.

Hence we can calculate the area as follows:

AB×BC2=8×62=482=24 \frac{AB\times BC}{2}=\frac{8\times6}{2}=\frac{48}{2}=24

Answer:

24 cm²

Video Solution
Exercise #2

Calculate the area of the triangle using the data in the figure below.

101010222AAABBBCCC

Step-by-Step Solution

To solve the problem of finding the area of triangle ABC \triangle ABC , we follow these steps:

  • Step 1: Identify the given measurements.
  • Step 2: Use the appropriate formula for the area of a triangle.
  • Step 3: Calculate the area using these measurements.

Let's go through each step in detail:
Step 1: From the figure, the base AB=10 AB = 10 and height AC=2 AC = 2 .
Step 2: The formula for the area of a triangle is: Area=12×base×height \text{Area} = \frac{1}{2} \times \text{base} \times \text{height} .
Step 3: Substituting the known values into the formula, we get:

Area=12×10×2=12×20=10 \text{Area} = \frac{1}{2} \times 10 \times 2 = \frac{1}{2} \times 20 = 10

Therefore, the area of triangle ABC \triangle ABC is 10.

Answer:

10

Video Solution
Exercise #3

Calculate the area of the triangle below, if possible.

7.67.67.6444

Step-by-Step Solution

To solve this problem, we begin by analyzing the given triangle in the diagram:

While the triangle graphic suggests some line segments labeled with the values "7.6" and "4", it does not confirm these as directly usable as pure base or height without additional proven inter-contextual relationships establishing perpendicularity or side/unit equivalences.

Without a clear base and perpendicular height value, we cannot apply the triangle's area formula Area=12×base×height \text{Area} = \frac{1}{2} \times \text{base} \times \text{height} effectively, nor do we have all side lengths for Heron's formula.

Therefore, due to insufficient information that specifically identifies necessary dimensions for area calculations such as clear height to a base or all sides' measures, the area of this triangle cannot be calculated.

The correct answer to the problem, based on insufficient explicit calculable details, is: It cannot be calculated.

Answer:

It cannot be calculated.

Video Solution
Exercise #4

Calculate the area of the triangle below, if possible.

8.58.58.5777

Step-by-Step Solution

The formula to calculate the area of a triangle is:

(side * height corresponding to the side) / 2

Note that in the triangle provided to us, we have the length of the side but not the height.

That is, we do not have enough data to perform the calculation.

Answer:

Cannot be calculated

Video Solution
Exercise #5

Calculate the area of the following triangle:

666777AAABBBCCCEEE

Step-by-Step Solution

The formula for the area of a triangle is

A=hbase2 A = \frac{h\cdot base}{2}

Let's insert the available data into the formula:

(7*6)/2 =

42/2 =

21

Answer:

21

Video Solution

Frequently Asked Questions

What is the formula for finding the area of any triangle?

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The universal formula for triangle area is Area = (Base × Height) ÷ 2. This works for all triangle types - equilateral, isosceles, scalene, right, and obtuse triangles. The height must be perpendicular to the base.

How do you find the area of a right triangle?

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For right triangles, you can use either leg as the base and the other leg as the height since they're perpendicular. Simply multiply the two legs and divide by 2: Area = (leg₁ × leg₂) ÷ 2.

What's different about calculating the area of an obtuse triangle?

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In obtuse triangles, the height often falls outside the triangle when drawn from the obtuse angle. You extend the base line to meet the perpendicular height line, but still use the same formula: Area = (Base × Height) ÷ 2.

When should I use Heron's formula instead of the basic triangle area formula?

+
Use Heron's formula when you know all three side lengths but don't know the height. The formula is Area = √[s(s-a)(s-b)(s-c)], where s = (a+b+c)/2 is the semi-perimeter.

How do I find a missing dimension if I know the triangle's area?

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Rearrange the area formula to solve for the unknown. If you need the height: Height = (2 × Area) ÷ Base. If you need the base: Base = (2 × Area) ÷ Height. Always ensure your units are consistent.

What are common mistakes students make when calculating triangle areas?

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Common errors include: 1) Forgetting to divide by 2, 2) Using the wrong measurements as base and height (they must be perpendicular), 3) Misidentifying the height in obtuse triangles, 4) Not converting units consistently.

How can I check if my triangle area calculation is correct?

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Verify your answer by: 1) Ensuring the height is perpendicular to the base, 2) Double-checking your arithmetic, 3) Confirming units are consistent, 4) Estimating if the result seems reasonable for the triangle's size.

What's the relationship between triangle area and squares or rectangles?

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A triangle is exactly half of a parallelogram (including rectangles and squares) with the same base and height. This is why we divide by 2 in the triangle area formula - we're finding half the area of the corresponding parallelogram.

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