Enter Calculation
Formula
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| Measurement | Value |
|---|---|
| Side 1 | 5 |
| Side 2 | 8 |
| Area | 144.2221 |
Enter a circle's radius in cm, m, in, or ft to instantly get its perimeter (circumference) using P = 2πr. Fast, accurate, and classroom-ready.
Enter the square’s side length to get its perimeter (P = 4 × side) — the total distance around the square — instantly.
Calculate a truncated cone’s surface area from top radius, bottom radius, and height. Get total surface area instantly for geometry and engineering.
Enter the radius and unit to compute the surface area of a ball (sphere) with S = 4πr². Get instant results in cm², m², or in².
Enter a cube’s side length to instantly calculate its total surface area (A = 6s²). Quick help for geometry, homework, and simple planning.
Use this online stopwatch to measure time intervals precisely. Start, stop, and reset with ease.
Free online countdown timer. Set hours, minutes, and seconds to count down easily. Simple, fast, and useful for work, study, or daily tasks.
Simple online counter tool. Increase, decrease, or reset numbers instantly. Set custom step values and limits with ease.
Use our free online alarm clock to wake up, stay on schedule, or manage tasks. Set alarms quickly and customize sound and time right in your browser.