Instructional Video
Khan Academy

SAT Prep: Test 8 Section 2 Part 4

9th - 12th
Advising students to become comfortable with the 30-60-90 triangles as an SAT prep skill, Sal finishes this review session with a geometry problem, an algebra problem with fractions, slopes, and median numbers. His tips and test-taking...
Instructional Video
Khan Academy

Khan Academy: Geometry: Ca Geometry: Circle Area Chords Tangent

9th - 10th
Demonstrates solutions to problems #71-75 of California Geometry released state test questions. Problems address Pythagorean theorem, 45-45-90 triangles, 30-60-90 triangles, circumscribed polygons, area, chord length, tangents to circles...
Instructional Video
Khan Academy

Khan Academy: Geometry: Ca Geometry: More Trig

9th - 10th Standards
The video tutorial [12:21] demonstrates solutions to problems #66-70 of California Geometry released state test questions. Problems address basic trigonometry ratios, 30-60-90 triangles.
Instructional Video
Khan Academy

Khan Academy: Triangles: Intro to 30 60 90 Triangles

9th - 10th Standards
Explains the special relationship of the lengths of the sides of a 30-60-90 triangle using the Pythagorean theorem.
Instructional Video
Khan Academy

Khan Academy: Triangles: 30 60 90 Triangle Side Ratios Proof

9th - 10th
This video explores proving the ratios between the sides of a 30-60-90 triangle.
Instructional Video
Sophia Learning

Sophia: Special Right Triangles

9th - 10th Standards
Special right triangles are investigated in this video tutorial. The lesson provides background knowledge and two videos that show the relationships of the sides in special right triangles and practice problems to test students'...
Instructional Video
Sophia Learning

Sophia: Special Right Triangles

9th - 10th Standards
Special right triangles are explored in this video tutorial. The lesson provides four videos that explain the side ratios for 45-45-90 and 30-60-90 triangles along with real-world examples involving each type of triangle.
Instructional Video
Sophia Learning

Sophia: Properties of Equilateral Triangles

9th - 10th
Equilateral triangles are explored in this learning tutorial, which includes several videos [4:18; 4:18; 3:18] and a PowerPoint presentation. The lesson includes an introduction of equilateral triangles and their key characteristics....
Instructional Video
Khan Academy

Khan Academy: Geometry: Circle Area Chords Tangent

9th - 10th Standards
This video [10:06] contains touches the following topics: Pythagorean theorem, 45-45-90 triangles, 30-60-90 triangles, circumscribed polygons, area, chord length and tangents to circles.