Practice finding the circumference of a circle. The formula is C = 2 × π × r, using π ≈ 3.14.
Multiply 2 × π × the radius: C = 2πr (or π × diameter). With a radius of 5 and π ≈ 3.14, the circumference is 2 × 3.14 × 5 = 31.4 units.
Cubles kits are geometry in your hands: nets, faces, edges and vertices that fold and click into a poseable 3D character. No scissors, no glue, about 15 minutes.
