Exploring Circumference and Area of Circles

Miss Wendell introduces the concept of circles, focusing on circumference, radius, diameter, and Pi. She explains how to measure circumference using simple tools and introduces formulas for calculating circumference and area. The video covers the relationship between radius and diameter, and how Pi is derived and used in calculations.

What can be used to measure the circumference of a small circle?

• A ruler directly

• A measuring tape

• A laser measure

• A string

Tags

CCSS.2.MD.A.1

What is the radius of a circle?

• The area covered by the circle

• The length across the circle through the center

• The total length around the circle

• The distance from the center to the edge

What does the diameter of a circle represent?

• Half the circumference

• Twice the radius

• The area of the circle

• The volume of the circle

Tags

CCSS.HSG.C.A.2

How is Pi (π) historically calculated?

• Radius divided by diameter

• Circumference divided by diameter

• Diameter divided by the radius

• Circumference multiplied by diameter

Tags

CCSS.HSG.GMD.A.1

What is the approximate value of Pi?

• 4.13

• 3.56

• 2.18

• 3.14

Tags

CCSS.HSG.GMD.A.1

Which formula can be used if the diameter of a circle is known?

• A = πr²

• C = πd

• C = 2πr

• A = 2πd

Tags

CCSS.7.G.B.4

What does the formula C = 2πr calculate?

• Diameter

• Radius

• Circumference

• Area

Tags

CCSS.7.G.B.4

How is the area of a circle calculated?

• πr²

• πd

• r/d

• 2πr

Tags

CCSS.7.G.B.4

What does 'leaving it in terms of Pi' mean in the context of circle calculations?

• Ignoring the value of Pi

• Using Pi in the final answer

• Multiplying Pi by itself

• Calculating without using Pi

Tags

CCSS.HSG.C.B.5

If the diameter of a circle is 12 inches, what is the radius?

• 6 inches

• 12 inches

• 24 inches

• 3 inches

Tags

CCSS.7.G.B.4