We found 19,542 reviewed resources for circles
Unknown Angle Problems with Inscribed Angles in Circles
9th - 10th CCSS: Designed
We know theorems about circles—now what? Class members prove a theorem, with half the class taking the case where a point is inside the circle and half the class taking the case where a point is outside the circle. The lesson plan then...
Similar Triangles in Circle-Secant (or Circle-Secant-Tangent) Diagrams
9th - 12th CCSS: Designed
First angle measures, now segment lengths. High schoolers first measure segments formed by secants that intersect interior to a circle, secants that intersect exterior to a circle, and a secant and a tangent that intersect exterior to a...
Special Triangles and the Unit Circle
11th - 12th CCSS: Designed
Calculate exact trigonometric values using the angles of special right triangles. Beginning with a review of the unit circle and trigonometric functions, class members use their knowledge of special right triangles to find the value of...
Inscribed Angles of Circles
9 mins 9th - 12th CCSS: Adaptable
Relationships in circles build from the many connections made throughout the geometry course. The instructor in the video explains these connections as she builds the concept of inscribed angles. Using examples, the narrator highlights...
How Do You Find the Center of a Circle?
4 mins 9th - 12th CCSS: Adaptable
The center of the circle is the center of attention for the resource. A brief video in the Socratica Geometry playlist shows how to find the center of a circle not on the coordinate plane. The method here is to construct the...
Calculating Area of a Circle: Lesson
2 mins 6th - 11th CCSS: Adaptable
It really is as easy as pi. The segment of a massive geometry playlist points out that the formula for the area of a circle is a relatively simple one. Using the formula, the presenter shows examples of finding the area of circles.
Angles Outside a Circle: Lesson
3 mins 6th - 12th CCSS: Adaptable
Understand the difference in finding angle measures. A segment of an extensive geometry playlist introduces the formula to find the measure of an angle formed outside of a circle. Using examples, the video shows how to calculate measures...
Equations of Circles: Finding the Equation of a Circle
11th - Higher Ed CCSS: Adaptable
It's all about location and size. With the aid of the interactive, pupils explore the relationship between the location and size of a circle and its equation. The learners use that relationship to determine the equation of a circle given...