Triangles: Closer Look at Isosceles Triangles, A
This clip focuses on isosceles triangles, explaining that the equal sides are called the legs, while the remaining side is called the base. The clip notes that the base angles have the same measure, adding that, "
this feature of an isosceles trian...
Triangles: Pythagorean Theorem, The
This clip introduces the Pythagorean Theorem, named for the Greek mathematician Pythagoras. In addition to explaining the theorem itself, the clip explains how it is commonly used, including as a way to determine if a triangle is a right triangle, a...
Triangles: Introduction to Triangles
This clip talks about the ways in which triangles are used in various professions. It also introduces the different types of triangles (equilateral, scalene and isosceles).
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...
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: 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."
Angles, Arcs and Sectors: Angles Formed by Intersecting Lines
This clip looks at angles that are formed by two intersecting lines, in the process explaining what constitutes vertical and supplementary angles.
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.
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, including "vertex" an...
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 measure of the other. The clip ...