geometrylabA PLACE FOR THINGS TO CLICK.Worksheets
A playground for curious minds

Free Geometry & Trigonometry Tools

A little play. A big aha. Move a point. Change an angle. Watch the math fall into place.

Find your next experiment
Start right here.
What happens at 90°?
Free to explore · No account needed
The unit circle LIVE EXPLORERDrag the point to explore
cos θ · x coordinatesin θ · y coordinate
Radius = 1

Make an angle. See the connection.

deg
0°180°360°

Quadrant I · both coordinates are positive.

 Open the full unit circle
12interactive explorers8shapes to discover16ideas explained100ways to practice
Follow your curiosity

Interactive Geometry Calculators & Explorers

What will click today? Pick something interesting. See where it takes you.

All tools & collections ↗
Geometry

Triangle discovery sandbox

Drag three vertices to discover triangle types, area, perimeter, and the centroid.

Visual explanation + stepsFree tool
Geometry

Triangle solver

Solve SSS, SAS, AAS, and ambiguous SSA triangles with worked steps.

Four solving modesFree tool
Trigonometry

Sine & cosine graph explorer

See amplitude, period, phase shift, and vertical shift change a wave in real time.

Visual explanation + stepsFree tool
Reference

Shape atlas

Compare the properties, formulas, and uses of familiar shapes.

Eight detailed shape pagesFree tool
Coordinates

Transformation playground

Translate, rotate, reflect, or scale a triangle and compare its coordinates and area.

Visual explanation + stepsFree tool
Practice

Worksheet builder

Create a printable practice sheet with an optional answer key.

8, 12, or 20 questionsFree tool
SMALL STEPS. REAL UNDERSTANDING.

You’ve got this. Try eight questions.

No timer, no pressure. Just a little practice and a clearer picture.

Let’s give it a go ↗
Keep your curiosity going

Explore our learning apps

One good question leads to another. Discover more free, interactive learning tools from the same maker.

Chemistry

Interactive Periodic Table

Meet the elements. Explore their properties and mix compounds in the chemistry sandbox.

Explore chemistry
Space

Astronomy Lab

Follow an orbit, explore Moon phases, and discover the worlds beyond our own.

Explore space
Biology

Biology Lab

Cross two parents, translate a gene into protein, and watch a population grow.

Explore biology
Coding

Kids Code

Guide a robot, snap code blocks together, and make your first real Python programs.

Explore coding
A little question. A clearer picture.

Geometry Lab: frequently asked questions

Wondering about the why? Start here.

What can I do with Geometry Lab?

Solve triangles, calculate area and volume, explore the unit circle, and watch graphs and shapes respond as you change their values. Each calculator connects the result to a diagram or worked explanation.

Explore all tools
Is Geometry Lab free to use?

Yes. The calculators, lessons, practice questions, and printable resources are free to use without an account. Calculations run in your browser.

About the lab
Which tool helps me find a missing side or angle?

For a right triangle with two known sides, start with the Pythagorean calculator. For other triangles, use the triangle solver with three sides, two sides and their included angle, two angles and a side, or the supported SSA case. Three angles alone cannot determine side lengths.

Open the triangle solver
Can I see how an answer is calculated?

Yes. Calculators show formula substitutions or worked steps, while the concept lessons explain the reasoning with examples and common mistakes. Change an input to see how the result changes.

Read the concept lessons
Can I use these resources for teaching or practice?

Yes. Try an eight-question practice round with explanations, create a worksheet with an optional answer key, or print a shape net to fold. Worksheets can contain 8, 12, or 20 questions.

Create a worksheet