## Area and Perimeter of Triangles, Parallelograms and Trapezoids

#### Aligned To Common Core Standard:

**Grade 4 Measurement** - 4.MD.A.3

How to Find the Area and Perimeter of Triangles, Parallelograms and Trapezoids - The goal of this topic is to help you easily calculate the area and perimeter of different polygons such as Triangles, Parallelograms and Trapezoids. Let's cover the basic so that you are able to at least solve easier problems on your own.
A Perimeter of any geometric figure is the distance around it, or the sum of all its sides. For instance, if you have to calculate sides of a square you simply multiply one of the sides by four.
Area of a Parallelogram is the product of its length of base b and height h. It is written as:
A = b.h
Area of a Triangle is the half of the length of base b multiplied by the height h. It is written as:
A = 1/2.b.h = bh/2.
Area of a trapezoid is half the product of the height and sum of all the length of its parallel sides, or product of height and average length of the bases: It is written as:
A = 1/2.b.(b_{1} + b_{2}) = [h. (b_{1} + b_{2})] / 2. These lessons and worksheets will help students quickly understand how to find the area and perimeter of these three geometric shapes.

### Printable Worksheets And Lessons

- Triangle Work Step-by-Step Lesson- Just add up the outside and the rest falls into place.
- Guided Lesson - One of each shape for you to master your skills on.
- Guided Lesson Explanation - The formulas start appearing from nowhere.
- Practice Worksheet - Believe or not, "trapezium" is a real word. I never thought it was true.
- Matching Worksheet - What are the correct measurements of each shape?

#### Homework Sheets

Time to go all geometry Ninja on us. We give a whole bunch of unique shapes to work with.

- Homework 1 - Perimeter of this triangle = AB + BC + CA
- Homework 2 - Perimeter of this particular rectangle = AB + BD + DC + CA
- Homework 3 - Perimeter = 2 x base + 2 x height

#### Practice Worksheets

The focus of these is on triangles and trapezoids.

- Practice 1 - Find the area and perimeter.
- Practice 2 - Area of triangle = 1/2 x base x height
- Practice 3 - Area of a rectangle = Length x Width