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
Illustrative Mathematics

Illustrative Mathematics: 6.g Same Base and Height, Variation 1

For Teachers 5th - 8th Standards
Make the following triangles on a geoboard. Remember that the pegs are equally spaced in a square grid. Compare the areas of the triangles. Aligns with 6.G.A.1.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 6.g Base and Height

For Teachers 5th - 8th Standards
The purpose of this task is to help students understand what is meant by a base and its corresponding height in a triangle and to be able to correctly identify all three base-height pairs. Aligns with 6.G.A.1.
Unknown Type
Khan Academy

Khan Academy: Areas of Shapes on Grids

For Students 6th - 8th Standards
In this exercise, students practice finding the areas of shapes on grids. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.
Handout
Math Is Fun

Math Is Fun: Area of Triangles Without Right Angles

For Students 9th - 10th Standards
Learn how to find the area of triangles without right angles. Find the formula to use depending on the information you know about the triangle: base and height, three sides, or two sides and an angle.
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.
Unknown Type
Khan Academy

Khan Academy: Area of Triangles

For Students 6th - 8th Standards
In this exercise, students practice finding the area of triangles. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.
Unknown Type
Khan Academy

Khan Academy: Use Pythagorean Theorem to Find Area and Perimeter

For Students 7th - 8th
Find the area and perimeter of triangles and quadrilaterals by first using the Pythagorean Theorem to find missing side lengths. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or...
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.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Area Grade 7

For Students 7th
[Free Registration/Login may be required to access all resource tools.] Find the area of different triangles given the base and the height.
Interactive
National Council of Teachers of Mathematics

Nctm: Illuminations: Area of Triangles

For Students 3rd - 8th Standards
To find the area of a triangle, try to make a parallelogram using a copy of the triangle.
eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 17.5 Sine to Find the Area of a Triangle

For Students 9th - 10th Standards
Learn how to sine to find the area of a triangle.
Handout
Quia

Ixl Learning: Area of Triangles

For Students 6th - 7th Standards
Brush up on your math skills relating to the area of triangles then try some practice problems to test your understanding.
Lesson Plan
Better Lesson

Better Lesson: Finding the Area of a Triangle

For Teachers 6th Standards
Sixth graders find the area of a triangle using square units and the area formula.
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
Activity
National Council of Teachers of Mathematics

Nctm: Illuminations: Igd: Area of a Triangle

For Students 9th - 10th
Use this interactive tool to learn how to find the area of a triangle. Click on "Instructions" for details on how to use this tool. Click on "Explore" for more ideas. [Requires Java.]
Activity
Shodor Education Foundation

Shodor Interactivate: Triangle Explorer

For Students 6th - 8th Standards
Students explore the nature of triangles and their area. An applet and instructor resources are included. [Requires Java.]
Interactive
Mangahigh

Mangahigh: Shape: Area of a Triangle

For Students 6th - 9th Standards
Determine the area of a triangle.
Interactive
Mangahigh

Mangahigh: Shape: Area of a Triangle Using Trigonometry

For Students 9th - 10th Standards
Teat your knowledge of determing the area of a triangle using trigonometry.
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
Sophia Learning

Sophia: Understanding the Area of a Triangle

For Students 7th - 8th
This lesson will explore ways to determine the area of a triangle.
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.
Unit Plan
Khan Academy

Khan Academy: Area of Right Triangles

For Students 5th - 7th Standards
Find the area of right triangles Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Applications of the Pythagorean Theorem

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson students use the Pythagorean Theorem to find perimeter and area. Students examine guided notes, review guided practice, watch instructional videos and...

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