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 b..
Angles, Arcs and Sectors: Calculating Many Angles When Only One is Known
This clip explains how to use what we know about special angle relationships to find the measure of several angles when we known the measure of just one. The explanation covers vertical angles, alternate interior angles,..
Angles, Arcs and Sectors: Complementary and Supplementary Angles
This clip explains that any two angles that have a sum of 90 degrees are called complementary angles. The clip adds that knowing two angles are complementary allows us to find the measure of one angle when we know the me..
Angles, Arcs and Sectors: Different Types of Angles
This clip introduces some of the most common angles, including the 90-degree angle (also known as the right angle), the 180-degree angle (also known as the straight angle), the acute angle and the obtuse angle.
Angles, Arcs and Sectors: Introduction to Angles
This clip explains what constitutes an angle and provides a brief discussion of the fields in which angle measurement is especially critical. The clip then defines a number of terms that are fundamental to understanding ..
Angles, Arcs and Sectors: Parallel Lines Intersected by a Transversal
This clip explains that several angles are created when a transversal intersects two parallel lines. The clip then defines alternate interior angles and corresponding angles.
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 measure..
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 radi..
Area and Volume: Finding the Area of a Parallelogram or a Triangle
This clip explains that finding the area of a parallelogram is much like finding the area of a rectangle. "The area of a parallelogram equals the base times the height," the clip states. The clip further notes that, " i..
Area and Volume: Finding the Area of a Rectangle
This clip explains what a rectangle is and how to determine its area. "The formula is easy to remember," the clip states. "The area of a rectangle is equal to the length times the width." Three practical problems follow ..