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# Video lessons for elementary geometry topics This is a collection of free video lessons for elementary and middle school geometry topics (grades 1-7). Please choose a topic from the list below.

## Area and perimeter: grades 3-5

Perimeter

Units of area

Problems to solve: area of rectangles

Area of rectangles and the distributive property

Area and perimeter problems — rectangular shapes

Area versus perimeter

Lines, rays, and angles

How to use a protractor to measure & draw angles

Estimating angles

How to draw a right angle (perpendicular line) and a rectangle

Parallelograms

Acute, obtuse, and right triangles

Polygons—introduction

Circles

Area and perimeter problems

Classify triangles

Volume of a rectangular prism and cubic units

Area of parallelograms and triangles

Area of polygons

Find the area of a triangle by drawing and measuring the altitude

Introduction to conversions between units of area

Volume of rectangular prism with fractional edge length

Unknown angle problems

Angles in a triangle

Drawing geometric shapes with given conditions

Drawing triangles with given conditions

Pi and the circumference of a circle

How to calculate the area of a circle, plus simple proof for the formula

The Pythagorean Theorem

Applications of the Pythagorean Theorem 1: area of an isosceles triangle

Applications of the Pythagorean Theorem 2: diagonal of a square

Applications of the Pythagorean Theorem 3: volume of a triangular prism

Applications of the Pythagorean Theorem 4: perimeter of a trapezoid

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