Two methods:
1. mark a point on the circumference of the round object; put a mark on the floor; line up the marks and roll the object along the floor until the mark retouches the floor; use the meter rule to find the distance between the marks on the floor.
2. measure the diameter of the round object using the meter rule and multiply it by π (pi ≈ 3.14159)
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If you have calibrated eyeballs
You can measure any object you like using tonnes, however, unless the object is a massive one like an Elephant or a Bus, there is likely to be lots of zeros after (or before) a decimal point which would make it not a very sensible unit to measure the mass of the object.
Length, Multiplied by Width. L x W Measure using a meter stick, yard stick, ect...
100 cubic metres - without using a calculator !
Oh, dude, you're hitting me with some math here! So, the circumference of a circle is calculated using the formula C = 2πr, where r is the radius. Since the circle is 1 meter round, the radius is 0.5 meters. Plugging that into the formula, you get C = 2π(0.5) = π meters, or about 3.14 meters. So, like, the circumference of a 1 meter round circle is approximately 3.14 meters.