Get Ari Curriculum Companion Exploring Circles

The circumference of a circle can be calculated using either of the following formulas: C=𝜋d or C=2𝜋r. We know that the diameter of the circle is 8 cm, and an approximation for pi is 3.14, so we can plug these values into the formula C=𝜋d. The formula becomes C=(3.14)(8), which simplifies to 25.12.

1:28 2:46 Area of a circle, formula explained - YouTube YouTube Start of suggested clip End of suggested clip So height is equal to radius. To find the base. We need to look at the circumference of the circle.MoreSo height is equal to radius. To find the base. We need to look at the circumference of the circle. And when we compare the base and the circumference.

Circumference of a circle For any circle with diameter, , the circumference, , is found by using the formula. C = π d. = π × 8. = 25.13 c m. Remember that, for any circle, the diameter is twice the radius, or d = 2 r . = 2 × 3. = 6 c m. C = π d.

6:17 8:48 How to Find Area and Circumference of a Circle - YouTube YouTube Start of suggested clip End of suggested clip 12 squared so a equals pi times 12 squared. Now we know that 12 squared is equal to 144. So the areaMore12 squared so a equals pi times 12 squared. Now we know that 12 squared is equal to 144. So the area equals pi times 144. We can rearrange.

0:00 1:47 Circumference of a Circle | MathHelp.com - YouTube YouTube Start of suggested clip End of suggested clip Instead of the radius. To find the radius. Remember that the radius of a circle is equal to half ofMoreInstead of the radius. To find the radius. Remember that the radius of a circle is equal to half of the diameter. So the radius of the circle shown is equal to half of 14 centimeters.

0:01 1:43 Find the area of a circle 7th grade math lesson for students - YouTube YouTube Start of suggested clip End of suggested clip Okay. Now I'm going to substitute in my values. I don't know the area so you've got a + 4 pi I canMoreOkay. Now I'm going to substitute in my values. I don't know the area so you've got a + 4 pi I can use either 3.14 in decimal or 22 over 7.

The formula for calculating the circumference is C=πdor C=2πr C = π d or C = 2 π r where d is the diameter and r is the radius.

3:33 6:38 How to Find the Area of a Circle | Area of a Circle Step by Step - YouTube YouTube Start of suggested clip End of suggested clip Now. This problem they give us the diameter. So we only want half the diameter we want the radiusMoreNow. This problem they give us the diameter. So we only want half the diameter we want the radius which would be two centimeters. So we plug in two for the radius. And squared.

1:03 4:07 The Area of the Circle - Math for Kids - YouTube YouTube Start of suggested clip End of suggested clip Number pi is represented by the greek letter pi.MoreNumber pi is represented by the greek letter pi.