⭕ Juegos de matemáticas y ciencias de primaria · 6.º de primaria · El círculo
Longitud y área del círculo: hazlo rodar, cuenta y calcula
ⓘ Los textos del juego están en inglés.
Haz rodar el círculo una vez y cuenta cuadrados una vez, y las fórmulas tienen sentido.
- Gratis, sin registro
- Zona de juego sin anuncios
- Ideal para tableta
- Modo padres
- Hoja A4
- 5 niveles
👪 Para las familiasJuego educativo para primaria: sin anuncios en esta página y sin registro. Los registros de práctica se quedan en este navegador y nunca se suben. El sitio solo usa estadísticas anónimas básicas; consulta la política de privacidad.
Cómo se juega
- Explore has four views: parts of a circle (drag the orange dot), roll it (one full turn along a line, pause or scrub back), area (count 1 cm squares) and ring (set both radii).
- The readings on the right follow the radius, using π = 3.14.
- Levels: radius and diameter, circumference, working back from the circumference, area, and rings and semicircles. Parents shows the slips and prints worksheets.
Unidad del currículo
Primary maths, grade 6: parts of a circle, circumference, area, rings and semicircles (PEP textbook, grade 6 volume 1, unit 5).
Para padres y docentes
Mistakes are grouped as radius/diameter swaps, C with the radius and no × 2, doubling the diameter, circumference vs area, forgetting ÷ 2, not squaring, squaring the diameter, ring as (R − r)² and semicircles without the diameter. The worksheet targets the weakest level, with answers.
Preguntas frecuentes
Why is the circumference π times the diameter?
Roll a circle one full turn and the distance it covers is its circumference. For every circle that distance is 3.14159… times the diameter. That fixed number is π; in primary school we use 3.14.
Where does A = πr² come from?
Cut the circle into many equal sectors and fit them into a near-rectangle: its length is half the circumference, πr, and its width is r, so the area is πr × r = πr². Counting squares gives close to 3.14 × r² too.
How do I find the area of a ring?
Ring area = outer circle − inner circle = π(R² − r²). It is not π(R − r)².