Ever stared at a triangle, a trapezoid, or a cone and blanked on which formula actually applies? Geometry Toolkit exists for exactly that moment — a clean, fast, no-fuss calculator built for anyone who needs accurate geometric results without digging through old textbooks or squinting at ad-cluttered websites.

The app covers the full range of shapes people actually need day to day. On the 2D side, you've got circles, squares, rectangles, triangles, parallelograms, and trapezoids, with both area and perimeter (or circumference) worked out the moment you enter your measurements. On the 3D side, spheres, cubes, rectangular prisms, cylinders, cones, and square pyramids are all covered for both surface area and volume — with trickier values like slant height calculated automatically behind the scenes, so you never have to work out an intermediate step yourself.

Every input is checked as you go. Enter a negative number or leave a field blank and the app tells you exactly what's wrong instead of returning a broken result. Try to build a triangle out of three sides that mathematically can't connect, and it'll catch that too. Results are shown rounded to two decimals by default, with a full-precision toggle for anyone who needs more digits.

Nothing gets lost, either — every calculation you run is automatically saved to a running History list, complete with your original inputs, so you can revisit or reopen a past calculation instead of retyping it from scratch.

What you'll find inside:
- Full formula coverage for 6 common 2D shapes and 6 common 3D shapes
- Automatic handling of derived values like slant height, with no manual pre-calculation needed
- Real-time input validation, including a triangle-inequality check
- Adjustable precision, from clean 2-decimal results to full 6-decimal accuracy
- A searchable History of every past calculation, with one-tap reopen
- A built-in Guide explaining exactly which formula is used for each shape

Whether it's a one-off homework problem, a DIY project measurement, or just double-checking your own math, Geometry Toolkit is built to get you a correct, clearly-labeled answer in seconds.