Circle Calculator vs Learn SQL

Know one measurement of a circle? Get all the others instantly. Type the radius, diameter, circumference or area – whichever you have – and Circle Calculator fills in the other three and writes every value right on the drawing. RING (ANNULUS) Enter the outer circle and the hole to get the ring area and ring width, plus both circumferences and the hole area. Ideal for pipes, washers, gaskets and round frames. ARCS, SECTORS & CHORDS Enter a radius and an angle, or a radius and an arc length, to get the arc length, chord and central angle. With Pro, also get the rise (sagitta), sector area, segment area and perimeter – and find the radius of any curve from its width and height (chord + rise), ideal for arches, curved walls and bends. SEE HOW IT'S SOLVED Every result comes with its formula and your numbers plugged in, for example C = 2πr = 2 × π × 5 = 31.4159. TYPE IT YOUR WAY Enter π and √ right in the field (3π, 5√3), use 3.14, 3.1416, full-precision π or your own value, and show 0 to 10 decimal places. Decimal comma or point both work. DRAWING OR CLASSIC Values sit directly on the circle in the Drawing layout. Prefer a list? Switch to Classic in Settings. FORMULA LIBRARY & HISTORY A searchable reference of circle, ring, arc and sector formulas with worked examples, and a history of your calculations to reopen any time (free keeps your last 5). EVERYWHERE YOU WORK iPhone, iPad and Mac, portrait or landscape, light or dark mode – in English, German, Japanese, Turkish, Spanish, French, Italian and Russian. On iPad and Mac: a sidebar, a full-height drawing and keyboard shortcuts. CIRCLE CALCULATOR PRO • No ads • Every step of every solution • Rise, sector area, segment area and the Chord + Rise tool • Unlimited history and Copy All The circle, ring and arc calculators are free to use. Pro options and prices are shown in the app. Terms of Use: https://monsware.com/circle-calculator-terms Privacy Policy: https://monsware.com/circle-calculator-privacy

SQL makes more sense when you can try it yourself. Learn SQL is a beginner-friendly, offline course for aspiring developers and anyone who wants to understand relational databases. Follow a clear roadmap, learn one concept at a time, and put each idea into practice immediately. LEARN STEP BY STEP Work through 45 guided lessons across seven focused topics: • Tables and SELECT foundations • Filtering data • Sorting, aggregates, and grouping • Relationships and joins • Advanced queries and window functions • Schema design, constraints, indexes, and query plans • PostgreSQL, Oracle, SQL Server, Teradata, and portable SQL PRACTICE WITH REAL QUERIES Write and run SQL against nine bundled practice datasets. Inspect tables and relationships with interactive ER diagrams, then explore your results in a clear, readable data grid. LEARN IN A SAFE ENVIRONMENT The Playground accepts SELECT queries only, so you can experiment without changing the data. Guided schema labs run in disposable database copies, giving you practical experience without risking your progress or app data. BUILT FOR FOCUSED LEARNING • Progressive hints and solutions • Estimated lesson times and difficulty labels • Interactive database diagrams • Searchable offline SQL quick reference • Save and favorite useful reference cards • Local progress and study streak tracking • Light and dark themes • Responsive design for phones and tablets • No account required • No internet connection required for course content Start with Foundations. Continue through the remaining six topics with a one-time lifetime in-app purchase. Purchases can be restored on supported devices. Whether you are preparing for a developer role, refreshing your database knowledge, or writing your first SELECT statement, Learn SQL helps you turn syntax into practical understanding at your own pace. Terms of Use: https://alphabeat.co.uk/terms-and-conditions Privacy Policy: https://alphabeat.co.uk/privacy-policy