Circumference = πd = π(10) ≈ 31.4 cm.

Distance = √((4-1)² + (6-2)²) = √(3² + 4²) = √(9 + 16) = √25 = 5 units.

In a 30-60-90 triangle, the ratio of the sides opposite the 30° and 90° angles is 1:2.

Using the Pythagorean theorem, hypotenuse = √(5² + 12²) = √(25 + 144) = √169 = 13 cm.

Using the Pythagorean theorem: c = √(3² + 4²) = √(9 + 16) = √25 = 5 cm.

Using the Pythagorean theorem, hypotenuse = √(3² + 4²) = √(9 + 16) = √25 = 5 cm.