Perimeter and Area of Polygons
Selected Reading
- Finding the perimeter or area of a rectangle in the coordinate plane
- Area of a trapezoid
- Area of a parallelogram
- Area involving rectangles and triangles
- Finding the area of a trapezoid on a grid by using triangles and rectangles
- Area of a triangle
- Finding the area of a right triangle or its corresponding rectangle
- Finding the area of a right triangle on a grid
- Area between two rectangles
- Area of a piecewise rectangular figure
- Finding the side length of a rectangle given its perimeter or area
- Word problem involving the area of a square or a rectangle
- Areas of rectangles with the same perimeter
- Distinguishing between the area and perimeter of a rectangle
- Area of a rectangle involving fractions
- Perimeter of a piecewise rectangular figure
- Finding the missing length in a figure
- Sides of polygons having the same perimeter
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Selected Reading
- Who is Who
- Computer Glossary
- HR Interview Questions
- Effective Resume Writing
- Questions and Answers
- UPSC IAS Exams Notes
Finding the area of a right triangle on a grid
Finding the area of a right triangle on a grid
In this lesson, we find the area of a right triangle on a grid. We draw the given right triangle on the grid and then measure its base and height on the grid. The formula for the area of triangle is used as follows to find area.
Area of triangle = $mathbf{frac{1}{2}}$ base × height
Find the area of the given right triangle on a grid.
Solution
Step 1:
Area of Triangle = $frac{1}{2}$ × b × h; b = base = 6; h = height = 3
Step 2:
Area of given right triangle on a grid = $frac{1}{2}$ × 6 × 3 = 9 square units
Find the area of the given right triangle on a grid.
Solution
Step 1:
Area of Triangle = $frac{1}{2}$ × b × h; b = base = 5; h = height = 7
Step 2:
Area of given right triangle on a grid = $frac{1}{2}$ × 5 × 7 = 17.5 square units