Learn around Area of a Triangle v The complying with Examples and Interactive Exercises


The area the a polygon is the variety of square units inside that polygon. Area is 2-dimensional choose a carpet or an area rug. A triangle is a three-sided polygon. We will certainly look in ~ several types of triangle in this lesson.

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To discover the area of a triangle, main point the base by the height, and also then division by 2. The division by 2 originates from the truth that a parallelogram can be divided into 2 triangles. For example, in the diagram come the left, the area of each triangle is same to one-half the area that the parallelogram.

Since the area of a parallelogram is A = B * H, the area the a triangle have to be one-half the area of a parallelogram. Thus, the formula for the area that a triangle is:


where b is the base, h is the elevation and · means multiply.

The base and height the a triangle must be perpendicular to every other. In every of the instances below, the base is a next of the triangle. However, depending on the triangle, the height may or may not it is in a next of the triangle. For example, in the right triangle in example 2, the elevation is a next of the triangle because it is perpendicular to the base. In the triangle in instances 1 and also 3, the lateral sides are not perpendicular to the base, therefore a dotted line is attracted to stand for the height.

Example 1: Find the area of an acute triangle with a basic of 15 inches and also a elevation of 4 inches.



 = · (15 in) · (4 in)

 = · (60 in2)

 = 30 in2

Example 2: find the area of a right triangle with a base of 6 centimeters and also a elevation of 9 centimeters.


 = · (6 cm) · (9 cm)

 = · (54 cm2)

 = 27 cm2

Example 3: Find the area that an obtuse triangle with a basic of 5 inches and also a height of 8 inches.



 = · (5 in) · (8 in)

 = · (40 in2)

 = 20 in2

Example 4: A triangle shame mat has actually an area the 18 square feet and also the base is 3 feet. Uncover the height. (Note: The triangle in the illustration to the right is NOT attracted to scale.)


In this example, we are offered the area that a triangle and one dimension, and we space asked to occupational backwards to discover the various other dimension.


18 ft2 = B7 (3 ft) · h

Multiplying both political parties of the equation by 2, we get:

36 ft2 = (3 ft) · h

Dividing both sides of the equation through 3 ft, us get:

12 ft = h

Commuting this equation, us get:

h = 12 ft

Summary: Given the base and also the height of a triangle, us can uncover the area. Provided the area and also either the basic or the height of a triangle, we can uncover the other dimension. The formula because that area of a triangle is:

 or  where b is the base and also h is the height.




Directions: read each inquiry below. Click as soon as in solution BOX and kind in your answer; then click ENTER. Her answers should be given as whole numbers greater than zero. After you click ENTER, a article will show up in the results BOX to indicate whether your answer is exactly or incorrect. To start over, click CLEAR.

1.Find the area that a triangle through a basic of 16 feet and a elevation of 3 feet. ANSWER BOX: A =  ft2  


2.Find the area of a triangle with a basic of 4 meters and a height of 14 meters. ANSWER BOX: A =  m2  


3.Find the area of a triangle with a base of 18 inches and a height of 2 inches. ANSWER BOX: A =  in2  



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A triangle shaped piece of record has one area the 36 square centimeters and a basic of 6 centimeters. Discover the height. (Hint: work-related backwards)ANSWER BOX: H =  cm  


5.A triangle shaped rug has an area that 12 square yards and the height is 3 yards. Discover the base. (Hint: work-related backwards)ANSWER BOX: B =  yd  


Perimeter & Area Unit
Perimeter of Polygons
Area that Rectangles
Area that Parallelograms
Area the Triangles
Area of Trapezoids
Practice Exercises
Challenge Exercises