4.1
Finding The Area Of A Triangle/Polygon
July 9, 2025
Maryam Syed
1
Min Read
AI Summary
To find the area of a triangle, use the formula 1/2 x base x height. For polygons, break them into triangles and sum their areas, or use specific formulas like Area = length x width for rectangles.
Finding the Area of a Triangle/Polygon
Finding the area of a triangle or polygon means calculating the amount of space inside the shape. In simpler words, it is measuring how much flat space the shape covers.
To find the area of a triangle we use the formula base times height divided by 2. (bh/2)
Example
What is the area of a triangle with base 8 cm and height 5 cm?
Multiply base and height → 8 × 5 = 40
Divide by 2 → 40 ÷ 2 = 20
So, the area is 20 cm².
To find the area of a polygon (regular shapes with more than 3 sides), we usually:
Break Them into Triangles: Find the area of each triangle and add them up.
Use Formulas: For example, area of a rectangle = length × width.