2331 views

Lec 112 - Problem involving angle derived from square and circle

Problem involving angle derived from square and circle Challenging problem to find an angle

Video is embedded from external source so embedding is not available.

Video is embedded from external source so download is not available.

No content is added to this lecture.

Go to course:

This video is a part of a lecture series from of khan

Lecture list for this course

Lec 1 - Euclid as the Father of Geometry

Lec 2 - Language and Notation of Basic Geometry

Lec 3 - Lines, Line Segments, and Rays

Lec 4 - Language and Notation of the Circle

Lec 5 - Angle Basics

Lec 6 - Measuring Angles in Degrees

Lec 7 - Using a Protractor

Lec 8 - Measuring Angles

Lec 9 - Complementary and Supplementary Angles

Lec 10 - Angles at the intersection of two lines

Lec 11 - Proof-Vertical Angles are Equal

Lec 12 - Angles Formed by Parallel Lines and Transversals

Lec 13 - Proof - Sum of Measures of Angles in a Triangle are 180

Lec 14 - Triangle Angle Example 1

Lec 15 - Triangle Angle Example 2

Lec 16 - Triangle Angle Example 3

Lec 17 - Challenging Triangle Angle Problem

Lec 18 - Proof - Corresponding Angle Equivalence Implies Parallel Lines

Lec 19 - Finding more angles

Lec 20 - Sum of Interior Angles of a Polygon

Lec 21- Congruent Triangles and SSS

Lec 22 - SSS to Show a Radius is Perpendicular to a Chord that it Bisects

Lec 23 - Other Triangle Congruence Postulates

Lec 24 - Two column proof showing segments are perpendicular

Lec 25 - Sum of the exterior angles of convex polygon

Lec 26 - Finding Congruent Triangles

Lec 27 - More on why SSA is not a postulate

Lec 28 - Congruent Triangle Proof Example

Lec 29 - Congruent Triangle Example 2

Lec 30 - Congruent legs and base angles of Isosceles Triangles

Lec 31 - Equilateral Triangle Sides and Angles Congruent

Lec 32- Equilateral and Isosceles Example Problems

Lec 33 - Another Isosceles Example Problem

Lec 34 - Example involving an isosceles triangle and parallel lines

Lec 35 - Figuring out all the angles for congruent triangles example

Lec 36 - Perimeter and Area Basics

Lec 37 - Triangle Area Proofs

Lec 38 - Interesting Perimeter and Area Problems

Lec 39 - Koch Snowflake Fractal

Lec 40 - Area of an Equilateral Triangle

Lec 41 - Area of Koch Snowflake (part 1) - Advanced

Lec 42 - Area of Koch Snowflake (part 2) - Advanced

Lec 43 - Challenging Perimeter Problem

Lec 44 - Similar Triangle Basics

Lec 45 - Similarity Postulates

Lec 46 - Similar Triangle Example Problems

Lec 47 - Similarity Example Problems

Lec 48 - Challenging Similarity Problem

Lec 49 - Similarity example where same side plays different roles

Lec 50 - Finding Area Using Similarity and Congruence

Lec 51 - Pythagorean Theorem Proof Using Similarity

Lec 52 - 30-60-90 Triangle Side Ratios Proof

Lec 53 - 45-45-90 Triangle Side Ratios

Lec 54 - 30-60-90 Triangle Example Problem

Lec 55 - The Golden Ratio

Lec 56 - Introduction to angles (old)

Lec 57 - Angles (part 2)

Lec 58 - Angles (part 3)

Lec 59 - Angles formed between transversals and parallel lines

Lec 60 - Angles of parallel lines 2

Lec 61 - The Angle Game

Lec 62 - Similar triangles

Lec 63 - Similar triangles (part 2)

Lec 64 - Angle Game (part 2)

Lec 65 - Acute Right and Obtuse Angles

Lec 66 - Area and Perimeter

Lec 67 - Circles: Radius, Diameter and Circumference

Lec 68 - Area of a circle

Lec 69 - The Pythagorean Theorem

Lec 70 - Pythagorean Theorem II

Lec 71 - 45-45-90 Triangles

Lec 72 - Intro to 30-60-90 Triangles

Lec 73 - 30-60-90 Triangles II

Lec 74 - Solid Geometry Volume

Lec 75 - Cylinder Volume and Surface Area

Lec 76 - Heron's Formula

Lec 77 - Part 1 of Proof of Heron's Formula

Lec 78 - Part 2 of the Proof of Heron's Formula

Lec 79 - Inscribed and Central Angles

Lec 80 - Area of Inscribed Equilateral Triangle (some basic trig used)

Lec 81 - Right Triangles Inscribed in Circles (Proof)

Lec 82 - Area of Diagonal Generated Triangles of Rectangle are Equal

Lec 83 - Triangle Medians and Centroids

Lec 84 - Triangle Medians and Centroids (2D Proof)

Lec 85 - Rhombus Diagonals

Lec 86 - 2003 AIME II Problem 7

Lec 87 - Perpendicular Radius Bisects Chord

Lec 88 - Circumcenter of a Triangle

Lec 89 - Circumcenter of a Right Triangle

Lec 90 - Three Points Defining a Circle

Lec 91 - Point Line Distance and Angle Bisectors

Lec 92 - Incenter and incircles of a triangle

Lec 93 - Angle Bisector Theorem Proof

Lec 94 - Inradius Perimeter and Area

Lec 95 - Angle Bisector Theorem Examples

Lec 96 - Medians divide into smaller triangles of equal area

Lec 97 - Exploring Medial Triangles

Lec 98 - Proving that the Centroid is 2-3rds along the Median

Lec 99 - Median Centroid Right Triangle Example

Lec 100 - Proof - Triangle Altitudes are Concurrent (Orthocenter)