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This is an annotated and hand-picked list of online games, activities, and lessons for angle-related topics in elementary school.

## Angles

**Guess the Random Angle**

Estimate and guess the angles shown.

www.crickweb.co.uk/assets/resources/flash.php?&file=angle

**Ladybug Leaf**

Guide the ladybug by giving her commands to turn 90° or 45°, right or left, or to move forward/backward.

nlvm.usu.edu/en/nav/frames_asid_287_g_2_t_3.html

**LadyBug Mazes**

Similar to the Ladybug Leaf, but this time you guide the ladybug through the maze.

nlvm.usu.edu/en/nav/frames_asid_141_g_2_t_3.html

**Angles**

Practice your knowledge of acute, obtuse, and alternate angles, plus relationships between angles such as vertical, adjacent, alternate, same-side, and corresponding.

www.shodor.org/interactivate/activities/Angles

**Angle Find!**

Click on the angle with the given angle measure within a geometric figure. Three different modes: Easy Cornering, Parallel Play, and Tangled Angles. Practices your ability to estimate angles and your knowledge of vertical angles, corresponding angles, and angles in a triangle.

puzzlezapper.com/aom/mathed/anglefind/anglefind.html

**Key to Geometry Workbooks**

Here is a non-intimidating way to prepare students for formal geometry. *Key to Geometry* workbooks introduce students to a wide range of geometric discoveries as they do step-by-step constructions. Using only a pencil, compass, and straightedge, students begin by drawing lines, bisecting angles, and reproducing segments. Later they do sophisticated constructions involving over a dozen steps-and are prompted to form their own generalizations. When they finish, students will have been introduced to 134 geometric terms and will be ready to tackle formal proofs.

**Geometry Bridge**

An interactive review lesson on types of angles, types of triangles, angle sum of a triangle, and the Pythagorean Theorem, for 5th-7th grade students. You get to build a bridge!

www.sharemylesson.com/teaching-resource/Geometry-Bridge-50018309/

**Turtle Pond**

Estimate length and angle measure while guiding a turtle to a pond using computer commands.

illuminations.nctm.org/Activity.aspx?id=3534

**Banana Hunt at Primary Games**

Help the monkey to find bananas and learn to estimate angles.

www.primarygames.co.uk/pg2/bhunt/bhunt.html

**Angles**

Practice obtuse/right/acute angles, and vertical/corresponding/alternate interior or exterior angle concepts

www.shodor.org/interactivate/activities/Angles

**Math Mammoth Geometry 1**

A self-teaching worktext for 4th-5th grades that covers angles, triangles, quadrilaterals, circle, symmetry, perimeter, area, and volume. The book contains lots of hand-son drawing exercises. Available as a download version ($6.90) and a printed copy.

www.mathmammoth.com/geometry_1.php

**Working with Angles**

An interactive lesson with explanations and quiz from Absorb Mathematics course written by Kadie Armstrong, a mathematician.

www.absorblearning.com/mathematics/demo/units/KCA003.html

**Angles in Polygons**

An interactive lesson with explanations and quiz from Absorb Mathematics course written by Kadie Armstrong, a mathematician.

www.absorblearning.com/mathematics/demo/units/KCA004.html

**Properties of Parallelograms**

Investigate the sides and interior angles of parallelograms using these two interactive tools.

math.kendallhunt.com/x19430.html

**Interior Angles**

A nice lesson and explanation about interior angles of polygons.

www.coolmath4kids.com/interior.html

**Dr. Math Introduces Geometry: Learning Geometry is Easy! Just ask Dr. Math!**

A supplement to middle school geometry, *Dr. Math Introduces Geometry* has a light tone, clear layout, and humorous cartoons by Jessica Wolk-Stanley. The best part is that the explanations to math questions are accurate and clear. You'll find answers to dozens of real questions from students who needed help understanding the basic concepts of geometry. This book covers angles, triangles, quadrilaterals, area, perimeter, Pi, circle parts, polyhedra, surface area, volume, nets, congruent transformations, and symmetry. Price: about $12 new, $1-$6 used.

**Geometry worksheets & quizzes**

Worksheets about complementary and supplementary angles, parallel, perpendicular, and intersecting lines, types of angles, basic shapes, area & perimeter of rectangles, and parts of a circle.

www.dadsworksheets.com/v1/Worksheets/Basic Geometry.html

**MB-Ruler - a triangular ruler for the computer screen**

MB-Ruler is a software that helps you to measure distances and angles on the computer screen, such as distances on a map or angles in any image. It has a ruler and a protractor, which are almost transparent over the image you are working with.

www.markus-bader.de/MB-Ruler

**Let's Practice Geometry - Free Worksheets**

Lots of free worksheets for high school geometry, including topics such as the Pythagorean Theorem, perimeter, area, volume, angle relationships, triangle theorems, similarity and congruence, logic, proofs, trig, polygons, and circles.

www.letspracticegeometry.com/free-geometry-worksheets

**Key to Geometry Workbooks**

Here is a non-intimidating way to prepare students for formal geometry. *Key to Geometry* workbooks introduce students to a wide range of geometric discoveries as they do step-by-step constructions. Using only a pencil, compass, and straightedge, students begin by drawing lines, bisecting angles, and reproducing segments. Later they do sophisticated constructions involving over a dozen steps-and are prompted to form their own generalizations. When they finish, students will have been introduced to 134 geometric terms and will be ready to tackle formal proofs.

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