Lesson 1

Circumference; diameter: about 60 mm, radius: about 30 mm. Radius; diameter: 120 mm, circumference: about 380 mm. Problem 3. A half circle is joined to an equilateral triangle with side lengths of 12 units. What is the perimeter of the resulting shape? ... A circular puzzle is 20 inches in diameter. All of the pieces are about the same size ... ................
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