Lisa is planning to put a border around the edge of a circular table. She needs to know how long the border needs to be so that she can buy the material. Which measurement does Lisa need?
She needs to know the diameter and then use this formula for the circumference.
C = pi * d
To determine the length of the border needed for a circular table, Lisa needs to find the circumference of the table. The circumference is the distance around the edge of a circle.
The formula to calculate the circumference of a circle is:
Circumference = 2πr
In this formula:
- "Circumference" represents the total length around the circle's edge (which is the length of the border Lisa needs).
- "π" (pi) is a mathematical constant approximately equal to 3.14159. In practical terms, you can use 3.14 or a more accurate value depending on your requirements.
- "r" represents the radius of the circular table, which is the distance from the center of the circle to any point on its edge.
Therefore, Lisa needs to measure the radius of the table. The radius is the distance from the center of the table to its edge. Once she knows the radius, she can substitute it into the formula to calculate the circumference of the circular table.