Please open in Safari
Sign-in and file saving are blocked inside KakaoTalk. Open the page in Safari to use every feature.
Sign-in and file saving are blocked inside LINE. Open the page in Safari to use every feature.
Tap the menu (⋯) button and open this page in Safari or Chrome instead. You can sign in there.
Pick a circle, rectangle or triangle, enter its measurements, and see the area and perimeter as you type.
Shape preview
Result
Area
314.16cm²
π × 10² = 314.16
A = π × r²
Perimeter
62.83cm
2 × π × 10 = 62.83
C = 2 × π × r
Enter the measurements and press Run —
Results will collect here.