MathIsPower4U / High School / Math
Lecture : Similar Triangles Using Angle-Angle
By James Sousa | Fundamentals of Geometry
Lecture 90 of 130
Rate this lecture -      More Lectures - Select Lecture...1 : Points, Lines, and Planes2 : Ruler Postulate and the Segment Addition Postulate3 : Segment Midpoint and Segment Perpendicular Bisector4 : Angle Basics5 : Animation: Types of Angles6 : Measuring Angles Using a Protractor7 : Angle Relationships and Types of Triangles8 : Similar Polygons9 : Congruent and Similar Triangles10 : The Pythagorean Theorem11 : Pythagorean Theorem and Converse of Pythagorean Theorem12 : Animation: The Sum of the Interior Angles of a Triangle13 : Complementary, Supplementary, and Vertical Angles14 : Angle Bisector15 : Bisector and Midpoint Exercises - Example 116 : Bisector and Midpoint Exercises - Example 217 : Introduction to Polygons18 : Classifying Polygons19 : Interior and Exterior Angles of a Polygon20 : Inductive Reasoning21 : Introduction to Deductive Reasoning22 : Introduction to Proof Using Properties of Equality23 : Introduction to Proof Using Properties of Congruence24 : Parallel and Perpendicular Lines and Planes25 : Parallel Line Postulate26 : Perpendicular Line Postulate27 : Angles and Transversals28 : Properties of Parallel Lines29 : Proof: Alternate Interior Angles Are Congruent30 : Proof: Consecutive Interior Angles Are Supplementary31 : Proof: Parallel Planes Cut by a Plane Forming Parallel Lines32 : Proof: Two lines Parallel to a Third are Parallel33 : Example 1: Parallel Line Properties34 : Example 2: Parallel Line Properties35 : Proof: Involving Two Pair of Parallel Lines36 : Corresponding Angles Converse37 : Proof: Alternate Interior Angles Converse38 : Proof: Alternate Exterior Angles Converse39 : Proof: Consecutive Interior Angles Converse40 : Proof: Adjacent Angles Formed by Perpendicular Lines are Congruent41 : Proof: If Two Lines Form Congruent Adjacent Angles...42 : Proof: If Ext. Sides of Two Adj. Acute Angles are Perpendicular..43 : Perpendicular Transversals of Parallel Lines44 : Examples 1: Perpendicular Transversals45 : Examples 2: Perpendicular Transversals46 : Perpendicular Bisector of a Segment on the Coordinate Plane47 : The Distance Formula48 : Determining the Shortest Distance Between a Line and a Point49 : Determining the Distance Between Two Parallel Lines50 : Proving the Triangle Sum Theorem51 : Introduction to the Interior and Exterior Angles of a Triangle52 : Proof: The Sum of the Exterior Angles of a Triangle is 360 Degrees53 : Proof: The Exterior Angles Theorem54 : How To Construct An Isosceles Triangle55 : Proof: The Isosceles Triangle Theorem56 : Examples: Using Properties of Isosceles Triangles..57 : Introduction to Congruent Triangles58 : Determining If Two Triangles are Congruent59 : Example 1: Prove Two Triangles are Congruent60 : Example 2: Prove Two Triangles are Congruent61 : How To Construct An Equilateral Triangle62 : Proof: The Equilateral Triangle Theorem63 : Examples: Using the Properties of Equilateral Triangles to Determine Values64 : Introduction to the Midsegments of a Triangle65 : Examples: Determining Unknown Values Using Properties of the Midsegments of a Triangle66 : Constructing the Perpendicular Bisectors of the Sides of a Triangle67 : Proof: Perpendicular Bisector Theorem68 : Proof: Perpendicular Bisector Theorem Converse69 : Examples: Determining Values Using the Properties of the Perpendicular Bisectors of a Triangle70 : Constructing a Perpendicular Bisector Using Geometers Sketchpad71 : Introduction to Angle Bisectors of a Triangle72 : Proof: The Angle Bisector Theorem73 : Proof: The Angle Bisector Theorem Converse74 : Constructing the Angle Bisectors of a Triangle75 : Constructing an Angle Bisector Using Geometers Sketchpad76 : Examples: Solving For Unknown Values Using Properties of Angle Bisectors77 : The Medians of a Triangle78 : Examples: Using the Properties of the Medians of a Triangle to Solve for Unknown Values79 : The Altitudes of a Triangle80 : Constructing an Altitude of a Triangle81 : Constructing the Altitude of a Triangle Using Geometers Sketchpad82 : Proof: The Angle of a Triangle Opposite The Longest Side is the Largest Angle83 : Triangle Inequality Theorem84 : Introduction to Indirect Proof85 : Ratios86 : Rates and Unit Rates87 : Proportions88 : Unit Scale89 : Scale Factor90 : Similar Triangles Using Angle-Angle91 : Similar Triangles Using Side-Side-Side and Side-Angle-Side92 : Indirect Measurement Using Similar Triangles93 : Solving for Unknown Values Using the Properties of Similar Triangles94 : The Triangle Proportionality Theorem95 : Using the Properties of the Triangle Proportionality Theorem to Solve for Unknown Values96 : The Triangle Angle Bisector Theorem97 : Using the Properties of the Triangle Angle Bisector Theorem to Determine Unknown Values98 : Introduction to Trigonometric Functions Using Triangles99 : Introduction to Trigonometric Functions Using Angles100 : 30-60-90 and 45-45-90 Triangles101 : Solving Special Right Triangles102 : Determining Trigonometric Function Values on the Calculator103 : Determining Trig Function Values Using Reference Angles and Reference Triangles104 : Determine Trigonometric Function Values Using the Unit Circle105 : The Reciprocal, Quotient, and Pythagorean Identities106 : Introduction to Inverse Trigonometric Functions107 : Domain, Range, and Signs of Trigonometric Function108 : Solve Right Triangles: Part 1 The Basics109 : Solving Right Triangles - Part 2 Applications110 : Determining Angles and Trig Function Values NOT Using Common Reference Angles111 : Radian Measure112 : The Law of Sines: The Basics113 : The Law of Sines: The Ambiguous Case114 : The Area of a Triangle using Sine115 : The Law of Sines: Applications I116 : The Law of Sines: Applications II117 : The Law of Cosines118 : The Law of Cosines: Applications119 : Introduction to Circles120 : Tangent Lines to a Circle121 : Tangent Lines to a Circle Example Problems122 : Prove Tangent Segments to a Circle from a Point are Congruent123 : Tangent Segments to a Circle Example Problems124 : If-Then Statements and Converses125 : The Converse, Contrapositive, and Inverse of an If-Then Statement126 : Truth Tables for Compound Statements127 : Truth Tables for Conditional Statements128 : Truth Table for the Biconditional Statement129 : Truth Tables: Showing Statements are Equivalent158 : Conic Sections: The Hyperbola part 1 of 2

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Courses Index
1 : Algebra I Review - High School   (Salman Khan / Khan Academy)
2 : Geometry   (Multiple Instructors / Brightstorm)
4 : Geometry – Worked Examples   (Salman Khan / Khan Academy)
5 : Algebra II   (Multiple Instructors / Brightstorm)
6 : Algebra II – 10th grade   (Derek Owens / Derek Owens)
7 : Algebra I - Martin Gay Textbook   (Julie Harland / MathGal)
8 : Algebra II - 2008 Prentice Hall Algebra 2 Textbook   (Brad Robb / WowMath)
9 : Algebra II – Worked Examples   (Salman Khan / Khan Academy)
10 : Algebra II - Worked Problems   (Brad Robb / WowMath)
11 : Pre-Calculus   (Multiple Instructors / Brightstorm)