Practical Problem: Finding Volume
A practical problem about volume is solved using division of a rational expression.
Subject: pi
Transcript: A SPHERE IS 4 TIMES PI TIMES THE RADIUS CUBED ALL OVER 3. PI IS AN IRRATIONAL NUMBER USED TO MEASURE CURVED GEOMETRICAL SHAPES LIKE SPHERES. WE'LL USE
Area and Volume: Finding the Area of a Circle
This clip explains that, to find the area of a circle, "
we multiply pi (approximately 3.14) by the radius squared. The clip also includes practical
Subject: pi
Area and Volume: Finding the Volume of a Cylinder
at its base instead of a rectangle
to find the volume of a cylinder, we multiply the area of a circle by the height. The formula is pi times radius
Subject: pi
Perimeter: Summary: Perimeter
, and also explores the parts of a circle and how, in conjunction with pi, they can be used to find the circle's circumference.
Subject: pi
Perimeter: Circles: Circumference, Radius and Diameter
circumference of a circle is to know its diameter." The clip then talks about the use of pi ("
the value of pi is approximately 3.14...pi is the number you get
Subject: pi
Angles, Arcs and Sectors: Angles, Circles and Sectors
This clip looks at the sector, a fraction of a circle's area formed by a central angle and its arc. "We can find the area of a sector," the clips explains, "
by multiplying the ratio of the central angle to the circle by the area of the circle."
Subject: pi
Angles, Arcs and Sectors: Angles, Circles and Arcs
This clip includes several practical problems in its discussion of angles in circles. It also explains how to find the length of an arc.
Subject: pi