Curated OER
New York State Testing Program-Grade 8
In this eighth grade worksheet, 8th graders solve problems that represent the grade level expectations for mathematics in New York State. The twenty-four page worksheet contains sixteen free response questions. Answers are...
Curated OER
Surface Area of Cones
Students find the surface area of cones. In this geometry lesson, students calculate the dimensions of each three-dimensional shape and use the correct formula to solve the problem. They relate concepts of cones to the real world.
Curated OER
Exploring Centers of a Triangle: Part 1
Students use problem solving skills, formal geometry, and The Geometer?s Sketchpad. They model and solve two real-world problems by constructing the in center and circumcenter of triangles.
Curated OER
Investigating the Idea of Tan
Fifth graders use tan to solve problems involving right-angled triangles. They solve equations of the form tan(8) =a, for a between 180 degrees and 360 degrees. They state the value of tan (8) in special cases.
Cuemath
Cuemath: Chords of a Circle
A comprehensive guide for learning all about chords of a circle with definitions, chords of a circle theorems, intersecting chords theorem, congruent circles, diameter, solved examples, and practice questions.
Cuemath
Cuemath: Segment of a Circle
This lesson expands your knowledge about circles by learning about the segment of a circle, which will include its mathematical definition, area of the segment, types of segments in a circle, theorems based on a segment of a circle, and...
Cut the Knot
Cut the Knot!: Monge's Theorem of Three Circles and Common Tangents
Very good site presenting a Trig problem dealing with tangents lines and circles, then linking the student to the solution
Oswego City School District
Regents Exam Prep Center: Arcs in Circles
Provided are definitions of arcs in circles, an example and theorems to assist with test preparation.
Mangahigh
Mangahigh: A Tangled Web: Angles, From Basic Rules to Circle Theorems
For this game, you must solve tricky angle problems as you help Itzi the robotic spider find a way through a maze of tangled webs, to rescue his family and then get back to his home. Includes a helpful tutorial.
CK-12 Foundation
Ck 12: Interactive Geometry: 10.2 Equations of Circles
Derive the equation of a circle with the help of the Pythagorean Theorem.
Math Is Fun
Math Is Fun: Unit Circle
Students learn about the unit circle. Topics include degrees, radians, and Pythagoras' Theorem. The tutorial consists of notes and examples.
CK-12 Foundation
Ck 12: Geometry: Angles Outside a Circle
[Free Registration/Login may be required to access all resource tools.] Solve problems containing angles outside a circle.
Geometry Help
Geometry Help: Circles
Explains the basic concept of circles with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
CK-12 Foundation
Ck 12: Geometry: Inscribed Angles in Circles
[Free Registration/Login may be required to access all resource tools.] Apply inscribed angle theorems.
CK-12 Foundation
Ck 12: Geometry: Angles on and Inside a Circle
[Free Registration/Login may be required to access all resource tools.] Solve problems containing angles on or inside a circle.
Mangahigh
Mangahigh: Shape: Inscribed and Central Angles in Circles
Use theorems to prove ideas of inscribed and central angles in circles.
Mangahigh
Mangahigh: Shape: Inscribed Angles in Circles
Use theorems to prove inscribed angles in circles.
Mangahigh
Mangahigh: Shape: Quadrilaterals Inscribed in Circles
Determine the missing angle measures of quadrilaterals inscribed in circles.
Illustrative Mathematics
Illustrative Mathematics: G C, G Co Tangent Lines and the Radius of a Circle
In this task, learners are shown a circle with center O and point P on the circle. L is a line that is a tangent to the circle at P. They must show that line OP is perpendicular to line L. Aligns with G-C.A.2, G-CO.A, and G-CO.C.9.
Mangahigh
Mangahigh: Shape: Radius and Chord Rule for Circles
Test your knowledge of radius and chord rules for circles.
Mangahigh
Mangahigh: Shape: Isosceles Triangles Inside Circles
Determine isosceles triangles inside a circle made from chords and radii.
Mangahigh
Mangahigh: Shape: Radius and Tangent Rule for Circles
Determine the rules for radius and tangents of circles.
Illustrative Mathematics
Illustrative Mathematics: G Gpe Explaining the Equation for a Circle
This problem examines equations defining different circles in the x-y plane. Students must use the Pythagorean Theorem to find equations whose solutions are points on the circle and explain why they work. Includes a GeoGebra worksheet...
Illustrative Mathematics
Illustrative Mathematics: G Co Inscribing a Square in a Circle
In this lesson plan, young scholars learn how to inscribe a square in a circle. Aligns with G-CO.D.13