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 problems, one of which includes the circle's diameter but not its radius.
Angles, Arcs and Sectors: Summary: Angles, Arcs and Sectors
This clip revisits some of the essential points in the lesson on angles, arcs and sectors, including angle measurement and special angle relationships that occur when lines intersect. The clip also mentions angle measurement in circles, and explains...
Perimeter: Finding the Length of a Semi-Circle
This clip uses practical problems to explain how to find the length of a semi-circle. "The length of the semi-circle is half the length of the circumference," the clip states. "That means, once we know the circumference of a circle, we can find the ...
Perimeter: Summary: Perimeter
This clip summarizes how to find the perimeter of several kinds of polygons. It explains the difference between irregular and equilateral polygons, and also explores the parts of a circle and how, in conjunction with pi, they can be used to find the...
Perimeter: Introduction to Perimeter
This clip introduces the term "perimeter," which it explains "...refers to the distance around a polygon." The clip references some of the more common polygons, including triangles, pentagons, hexagons and octagons. The clip also distinguishes betwe...
Perimeter: Circles: Circumference, Radius and Diameter
This clip explores the perimeter of circles. "The distance around a circle is called its circumference," the clip explains. "One way to find the circumference of a circle is to know its diameter." The clip then talks about the use of pi ("
the valu...