## Alternate Exterior Angles

Video of the Day

Definition of alternate exterior angles

Definition of a transversal

How to identify alternate exterior angles

The angle measure of alternate exterior angles

The difference between alternate exterior angles and alternate interior angles

For more information please see …. Alternate Exterior Angles

## Isosceles Trapezoid

Todays featured video

Video of the Day

Properties of an isosceles trapezoid

The featured video today explains the properties of an isosceles trapezoid.

You will learn ……..

Definition of an isosceles trapezoid

The properties of the legs of an isosceles trapezoid

The properties of the angles of an isosceles triangle

For more information please see Trapezoids

## Finding Area of Triangle on a Coordinate Plane

Featured Video of the Day

Finding the area of a Triangle on a coordinate plane.

Imagine you have to drive to watch your favorite sports team play. Based on many factors like traffic, time, or road conditions, there are many different paths you could follow to arrive at your destination. In the same fashion, there are several paths one can take to calculate the area of a triangle based on the information given. The video of the day describes one method.

In this video you will learn…….

A method that can be used to find the area of a triangle when altitude is not given.

A method to find the area of a triangle without a right angle.

How to use the three vertices to find the area of a triangle.

The formula for finding the area using the coordinate plane method.

Watch an example problem using the coordinate plane method.

For more information please see Area of a triangle

## Complementary Angles

Featured video of the day

Hope this video helps out in Math class.

**In this video you will learn.**

Definition of Complementary Angles

How to determine if an angle is complementary or a supplementary angle.

A sample problem involving complementary angles

Definition of a supplementary angle

For more information please see Complementary Angles

## Area of a triangle

The goal of this post is to give you several methods for finding the area of a triangle and a video that goes with each method. The method used to find the area is based on the information you are given.

If you know the **Base and Altitude** use **half base times height**

If you don’t know the **altitude** use **Heron’s formula**

If you know **Two sides and included angle **use **Side Angle Side ( SAS)**

If you know** X and Y vertices of the corners **use **Box Method**

If you know **Triangle is equilateral **use ** Equilateral Triangle Area**

If you know **Triangle is isosceles **use **½ base times height**

Video Half base * height

For even more information on finding the area of a triangle please see.Finding the area of a triangle

## Finding the area of a triangle

The goal of this post is to give you several methods for finding the area of a triangle and a video that goes with each method. The method used to find the area is based on the information you are given.

If you know the **Base and Altitude** use **half base times height**

If you don’t know the **altitude** use **Heron’s formula**

If you know **Two sides and included angle **use **Side Angle Side ( SAS)**

If you know** X and Y vertices of the corners **use **Box Method**

If you know **Triangle is equilateral **use ** Equilateral Triangle Area**

If you know **Triangle is isosceles **use **½ base times height**

Video Half base * height

For even more information on finding the area of a triangle please see.Finding the area of a triangle

## Area of Plane Figures

Finding area of plane figures

Area is the space covered in a flat, 2-dimensional plane inside a bounded region. Think of area in terms of painting a wall. The area of plane shapes is the amount of units squared that can fit inside the shape. It is measured in units squared.

When finding the area of plane figures you need specific measures. One of the greatest lessons for students is deciding what information they have given and which formula they need to use to find the area of the plane figures.

Area can also be found on a coordinate plane using order pairs to find necessary dimensions.

You can access videos and informational pages for each of the plane shapes on our area of plane figures formula page. The following plane figures are covered.

Triangles

Circle

Trapezoid

Parallelogram

Rectangle

Square

Rhombus

Also, for most of the plane figures I have a calculator that calculates area, diagonal length, and volume for each of the plane figures. Here is a link to Math calculators