Whiteboard
SMART Technologies

Smart: Area of a Triangle

For Teachers 5th - 8th Standards
This SMART whiteboard activity will help students learn the formula for finding the area of a triangle. Students will practice what they have learned by using examples created for visual and kinesthetic learners.
Lesson Plan
Better Lesson

Better Lesson: Finding the Area Review and Assessment

For Teachers 6th Standards
Sixth graders find the area of rectangles, triangles, parallelograms, and trapezoids by using formulas or by composing into rectangles or triangles.
Lesson Plan
Other

Nearpod: Area & Perimeter: Rectangle

For Teachers 3rd Standards
In this instructional activity on area and perimeter, 3rd graders will learn how to find the area and perimeter of rectangles by applying formulas.
Interactive
Khan Academy

Khan Academy: Area of Triangles

For Students 6th Standards
Demonstrates the logic behind the formula for the area of a triangle. Includes several practice problems and their explanations.
Activity
National Council of Teachers of Mathematics

Nctm: Illuminations: Igd: Area of a Parallelogram

For Students 3rd - 8th Standards
This applet will show you how to divide the parallelogram into pieces, arrange them together to form a rectangle, and then use the formula for the area of a rectangle to find the area of the parallelogram.
Lesson Plan
Better Lesson

Better Lesson: Finding the Area of a Trapezoid

For Students 6th Standards
Sixth graders find the area of a trapezoid by decomposing it into triangles and using the formula
Handout
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Faq, Geometric Figures

For Students 9th - 10th Standards
This page brings you to a table of contents of three-dimensional figures. Selecting a figure will bring you to a page defining and illustrating the figure with applicable formulas listed.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Unknown Dimensions Using Formulas Grade 7

For Students 7th
[Free Registration/Login may be required to access all resource tools.] Given a perimeter or area of a figure, use formulas to solve for the unknown or missing dimensions.
Lesson Plan
Alabama Learning Exchange

Alex: Students Only! No Teachers Aloud

For Teachers 3rd - 5th
The students will be introduced to area and perimeter. The teacher will pose a real-life situation in which the students will have a chance to explore an actual section outside to determine the area and perimeter of a set location.
Lesson Plan
Homeschool Math

Homeschool Math: Area of Triangles

For Students 4th - 6th Standards
This lesson presents the idea that the area of any triangle is exactly half of a certain parallelogram -- thus we get the familiar formula of multiplying the base and the altitude and taking half of that. The lesson contains varied...
Unit Plan
Vernet -Virtual Education Resources Network

Salon Hogar: Referencia Rapida De Formulas Geometricas

For Students 9th - 10th Standards
This site provides the user with a useful reference to different geometric forms, their elements, formulas, and areas. Entirely in Spanish.
Whiteboard
ClassFlow

Class Flow: Area Rectangle

For Teachers 3rd - 8th Standards
[Free Registration/Login Required] This flipchart will help students to solve the area for various rectangles on graph paper. It asks the students to define and solve for area using the appropriate formula.
Whiteboard
ClassFlow

Class Flow: Area Rectangles

For Teachers 3rd - 8th Standards
[Free Registration/Login Required] In this lesson students will understand area measured in square centimeters. They will understand and use the formula in words for the area of a rectangle.
Activity
The Math League

The Math League: Area and Perimeter

For Students 9th - 10th Standards
This tutorial provides a brief introduction about what area is, then gives the formulas for area of a square, rectangle, parallelogram, trapezoid, triangle, and circle. Examples of each formula are provided.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 6.ee Rectangle Perimeter 3

For Teachers 5th - 8th Standards
The purpose of this task is to ask students to write expressions and to consider what it means for two expressions to be equivalent. Aligns with 6.EE.A.
Handout
CK-12 Foundation

Ck 12: Geometry: Triangles and Quadrilaterals Study Guide

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This study guide reviews the formulas for area and perimeter of triangles and different kinds of quadrilaterals.
Whiteboard
ClassFlow

Class Flow: Area of Triangles

For Teachers 3rd - 5th Standards
[Free Registration/Login Required] This flipchart explores the formula for finding the area of a triangle. Examples and hints are given to help students. A video clip is included, showing how to find the height of a triangle, given the...
Activity
Texas Instruments

Texas Instruments: How Totally Square Part Ii

For Teachers 6th - 8th Standards
Students understand the concept of perimeter of a square, and discover its formula.
Website
National Council of Teachers of Mathematics

The Math Forum: Elementary Geometry Circles

For Students 9th - 10th Standards
The Math Forum offers an archive of question and answer sessions on circles and how they relate to geometry.
Activity
Discovery Education

Discovery Education: Web Math: Find Out Things About a Square

For Students 9th - 10th
WebMath will calculate the side length, diagonal length, perimeter, area, or volume, given the side, perimeter, diagonal, or area. This site also displays formulas for a square.
Handout
Purple Math

Purplemath: Geometry Word Problems: Introduction

For Students 9th - 10th Standards
Introduces how to set up and solve simple geometric-figure word problems. Includes advice regarding formulas to memorize.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 7.g Designs

For Teachers 7th
In this lesson plan, 7th graders use the formula for circles to determine the area and perimeter.
Handout
Wolfram Research

Wolfram Math World: Squares

For Students 9th - 10th Standards
MathWorld provides multiple definitions and formulas for the mathematical term, square.
Graphic
Curated OER

Find Out Things About a Square

For Students 9th - 10th
Webmath will calculate the side length, diagonal length, perimeter, area, or volume, given the side, perimeter, diagonal, or area. This site also displays formulas for a square.