Answer:
To find the circumference of a circle with diameter 25cm, we can use the formula:
Circumference = π × Diameter
where π (pi) is a mathematical constant approximately equal to 3.14159.
Substituting the diameter of 25cm, we get:
Circumference = π × 25cm
= 3.14159 × 25cm
= 78.53975cm
Therefore, the circumference of the circle with diameter 25cm is approximately 78.54cm.
To find the circumference of a circle with diameter 2.5cm, we can again use the same formula:
Circumference = π × Diameter
Substituting the diameter of 2.5cm, we get:
Circumference = π × 2.5cm
= 3.14159 × 2.5cm
= 7.85398cm
Therefore, the circumference of the circle with diameter 2.5cm is approximately 7.85cm.