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- Skluzavka: 1
- My, what a lovely cake! If only I knew the diameter and circumference of all the cakes I could make it at home!
- But what does 2πr even mean?! And how is the diameter 2 times the radius?
- How about we do an example?
- Diameter
- The line down the middle is the diameter. Think of it like half of the cake. It's important to know that the diameter is 2 times the radius. To find the circumference or all the way around the circle use the formula 2πr.
- Radius
- Skluzavka: 2
- Circumference Examples
- Let's say the radius is 6. The diameter is two times that. 6 x 2 = 12. Easy peasy! The diameter is 12!Now this part can get a little tricky. 2πr stands for 2 times the radius times pi. In some examples they use 3.14 for an estimation for pi. Ex.1: Whats approximately the diameter and circumference of the circle? First find the diameter multiply 6 times 2. 6 x 2 = 12 inches. Now for the circumference. Since we now have the diameter we just have to multiply it by π, or 3.14 in this case.12 x 3.14 = 37.68 inches. (Feel free to use a calculator!)The circumference is 37.68 inches.The same goes for the other 2 cake pans. The very small one has a radius of 3" and a diameter of 6". The circumference is about 18.84 inches. The medium cake pan have a radius of 5" and a diameter of 10". The circumference is about 31.4 inches.
- 6
- 6
- 6"
- Skluzavka: 3
- Diameter
- Who knew finding the circumference and diameter was so easy! I better get looking for cake pans!
- I'm glad I could help! Invite me over when you finish the cake!
- Circumference: Distance around the circle. (Perimeter)Diameter: Half of the circle.Radius: Half of the diameter.
- Skluzavka: 0
- Well your in luck! I remember how to find both of those. Let's break it down step by step.
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