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# Finding perimeter when a side length is missing | Math | 3rd grade | Khan Academy

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By Khan Academy

Lindsay finds the perimeter of a figure when a side length is not given.

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# Finding perimeter

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By Khan Academy

Find perimeter by adding side-lengths of various figures.

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# Finding perimeter

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By Khan Academy

Find perimeter of various shapes.ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½

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# Grade 3 Math Perimeter 3 MD 8

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By EngageNY

Solve real world problems involving perimeters of polygons, including finding the perimeter given the side lengths and finding an unknown side length

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# Introduction to perimeter

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By Khan Academy

Find perimeter by adding side-lengths of various figures.

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# Basics of Area Perimeter and Volume of Rectangular Shapes.

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By tecmath

This is a basic lesson in working out the perimeter area or volume or rectangular shapes. A house plan is used to show how to find the perimeter of a rectangle. Examples are shown for formulas of perimeter and area.

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# Perimeter of a shape

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By Khan Academy

Find perimeter of various shapes.ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½

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# Area and Perimeter - Khan Academy

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By Khan Academy

Start by learning how to calculate the perimeter and area of squares, rectangles, and triangles. Note the explanation of why perimeter measurements are in meters and area measurements are in square meters.

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# Calculating the area and the perimeter

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By MathPlanetVideos

Calculate the perimeter and the area in feet

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# Word Problem Involving the Perimeter of a Rectangle – Ex 1

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By PatrickJMT

YouTube presents Word Problem Involving the Perimeter of a Rectangle, an educational video resource on math.

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# Word Problem Involving Perimeter of a Triangle - ex 2

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By PatrickJMT

YouTube presents Word Problem Involving Perimeter of a Triangle - ex 2, an educational video resource on math.

**In this video**

# Part 2 of proof of Heron's formula | Perimeter, area, and volume | Geometry | Khan Academy

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By Khan Academy

Video shows that the expression in part 1 is identical to Heron's Formula. This video demonstrates how to use Heron's Formula to determine the area of a triangle while only knowing the lengths of the sides

**In this video**

# Area of an equilateral triangle | Perimeter, area, and volume | Geometry | Khan Academy

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By Khan Academy

Finding the formula for the area of an equilateral triangle with side s. All Khan Academy content is available for free at www.khanacademy.org

**In this video**

# Heron's formula | Perimeter, area, and volume | Geometry | Khan Academy

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By Khan Academy

Using Heron's Formula to determine the area of a triangle while only knowing the lengths of the sides. All Khan Academy content is available for free at www.khanacademy.org

**In this video**

# Part 1 of proof of Heron's formula | Perimeter, area, and volume | Geometry | Khan Academy

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By Khan Academy

In this video, the insructor explores and demonsrates the proof of Heron's Formula. The instructor demonstrates with computer software.

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# [4.MD.3-2.0] Area and Perimeter - Common Core Standard

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By Freckle education

Apply the perimeter formula for rectangles in real world and mathematical problems

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# [4.MD.3-1.0] Area and Perimeter - Common Core Standard

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By Freckle education

Apply the area formula for rectangles in real world and mathematical problems

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# Volume of a sphere | Perimeter, area, and volume | Geometry | Khan Academy

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By Khan Academy

"Find the volume of a sphere with a diameter of 14cm." Sal Khan solves this problem during this video clip.

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# Cylinder volume and surface area | Perimeter, area, and volume | Geometry | Khan Academy

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By Khan Academy

The other frequently occurring shape is the cylinder. This video will introduce the cylinder and teach you the formulas for finding its surface area and volume.

**In this video**