Calculating Area and Circumference of Circles

This video tutorial provides an overview of circles, focusing on key concepts such as radius, diameter, circumference, and area. It explains how to calculate the circumference and area of a circle, and how to determine the radius and diameter from given values. The tutorial includes examples and emphasizes the importance of understanding these fundamental geometric concepts.

What is the diameter if the radius of a circle is 8 units?

• 16 units

• 4 units

• 8 units

• 32 units

Tags

CCSS.7.G.B.4

If the diameter of a circle is 14 units, what is its radius?

• 7 units

• 28 units

• 21 units

• 14 units

Tags

CCSS.7.G.B.4

Which formula can be used to calculate the circumference of a circle?

• C = πd

• C = πr^2

• C = 2πr

• Both A and B

Tags

CCSS.7.G.B.4

How is the circumference of a circle directly related to its diameter?

• C = πd

• C = d^2

• C = d/π

• C = π/d

Tags

CCSS.7.G.B.4

If the circumference of a circle is 31.4 units, what is the radius?

• 5 units

• 10 units

• 15 units

• 20 units

Tags

CCSS.7.G.B.4

If a circle's circumference is 62.8 units, what is its diameter?

• 40 units

• 20 units

• 30 units

• 10 units

Tags

CCSS.7.G.B.4

What is the area of a circle with a radius of 7 units?

• 44 units^2

• 154 units^2

• 88 units^2

• 22 units^2

Tags

CCSS.7.G.B.4

What is the formula to calculate the area of a circle?

• A = πr^2

• A = 2πr

• A = πd

• A = πr

Tags

CCSS.7.G.B.4

Given an area of 78.5 square units, what is the approximate radius of the circle?

• 10 units

• 5 units

• 20 units

• 15 units

Tags

CCSS.7.G.B.4

Given an area of 314 square units, what is the diameter of the circle?

• 10 units

• 40 units

• 20 units

• 30 units

Tags

CCSS.7.G.B.4