1.Ancient Egyptians used math to figure out how big is a circle. They found different ways of measuring circle.

2. Did you know that circumference is almost 3 times as much as the diameter.

3.The Indians made numbers in the sixteenth century.

4. The = sign was invented 1557.

2. Did you know that circumference is almost 3 times as much as the diameter.

3.The Indians made numbers in the sixteenth century.

4. The = sign was invented 1557.