are most petri dishes the same size?
if so what would the diameter of one be?
i need to find the surface area of a petri dish
100mm is standard diameter.
I answered below.
thanks
Most petri dishes come in standardized sizes, but there can be variations depending on the manufacturer and the specific purpose of the dish. The most common size for a petri dish is 90-100 millimeters (mm) in diameter.
To find the surface area of a petri dish, you can use the formula for the area of a circle, which is:
A = πr^2
where A is the surface area and r is the radius of the circle (which is half of the diameter). So, to find the surface area of a petri dish, you would follow these steps:
1. Measure the diameter of the petri dish. Let's say it is 90mm.
2. Divide the diameter by 2 to find the radius:
radius = diameter / 2 = 90mm / 2 = 45mm
3. Square the radius:
r^2 = 45mm * 45mm = 2025mm^2
4. Multiply the squared radius by π (pi):
A = π * 2025mm^2 ≈ 6361.73mm^2
Therefore, the surface area of the petri dish would be approximately 6361.73 square millimeters.