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Wesley Lin
Home
Learn With Me
Algebra
Basic Arithmetic
Smart Math
Exponents
The Radicals
Fraction, Ratio and Percentage
Fraction
Ratio
Percentage
Decimal
Basic Algebra
Speed Problems
Difference of Squares
Sequence
Arithmetic Sequence
Geometric Sequence
Other Sequences
Inequality
Logic
The "Operator" Questions
Chart Reading
Graphing
Geometry
Angle Basics
Angle Chasing
Area / Perimeter of Regular Shapes
Perimeter of Irregular Shapes
Area of Irregular Shapes
Pythagorean Theorem
Triangular Inequality
Equilateral Triangle
Similar Triangle
Circles
Tangent Circles / Spheres
Four Points on A Circle
POP
Ptolemy's Theorem
Inscribed and Circumscribed Circle
Spatial Visualization
Solids (3D)
Volume and Surface Area of 3D Shapes
Number Theory
The Parity Trick
Unit Digit
Factorials
Prime Number
Factors and Prime Factorization
LCM and GCF
Calendar Problem
Clock (Time) Problem
Remainder
Modular Math
Counting
Simple Permutation
Casework
Constructive Counting
Complementary Counting
P.I.E.
How Many Whole Number Questions
Mean, Median and Mode
Counting Paths
Pigeonhole Principle
Simple Probability
Conditional Probability
Stars and Bars
Rotational Probability
Expected Values
Recursive Thinking (States)
Geometric Probability
Hockey Stick Identity
Permutation
Combinatorial Game Theory
Combination
Coloring the Checkerboard
Some Tricks
Resources
Wesley Lin
Home
Learn With Me
Algebra
Basic Arithmetic
Smart Math
Exponents
The Radicals
Fraction, Ratio and Percentage
Fraction
Ratio
Percentage
Decimal
Basic Algebra
Speed Problems
Difference of Squares
Sequence
Arithmetic Sequence
Geometric Sequence
Other Sequences
Inequality
Logic
The "Operator" Questions
Chart Reading
Graphing
Geometry
Angle Basics
Angle Chasing
Area / Perimeter of Regular Shapes
Perimeter of Irregular Shapes
Area of Irregular Shapes
Pythagorean Theorem
Triangular Inequality
Equilateral Triangle
Similar Triangle
Circles
Tangent Circles / Spheres
Four Points on A Circle
POP
Ptolemy's Theorem
Inscribed and Circumscribed Circle
Spatial Visualization
Solids (3D)
Volume and Surface Area of 3D Shapes
Number Theory
The Parity Trick
Unit Digit
Factorials
Prime Number
Factors and Prime Factorization
LCM and GCF
Calendar Problem
Clock (Time) Problem
Remainder
Modular Math
Counting
Simple Permutation
Casework
Constructive Counting
Complementary Counting
P.I.E.
How Many Whole Number Questions
Mean, Median and Mode
Counting Paths
Pigeonhole Principle
Simple Probability
Conditional Probability
Stars and Bars
Rotational Probability
Expected Values
Recursive Thinking (States)
Geometric Probability
Hockey Stick Identity
Permutation
Combinatorial Game Theory
Combination
Coloring the Checkerboard
Some Tricks
Resources
More
Home
Learn With Me
Algebra
Basic Arithmetic
Smart Math
Exponents
The Radicals
Fraction, Ratio and Percentage
Fraction
Ratio
Percentage
Decimal
Basic Algebra
Speed Problems
Difference of Squares
Sequence
Arithmetic Sequence
Geometric Sequence
Other Sequences
Inequality
Logic
The "Operator" Questions
Chart Reading
Graphing
Geometry
Angle Basics
Angle Chasing
Area / Perimeter of Regular Shapes
Perimeter of Irregular Shapes
Area of Irregular Shapes
Pythagorean Theorem
Triangular Inequality
Equilateral Triangle
Similar Triangle
Circles
Tangent Circles / Spheres
Four Points on A Circle
POP
Ptolemy's Theorem
Inscribed and Circumscribed Circle
Spatial Visualization
Solids (3D)
Volume and Surface Area of 3D Shapes
Number Theory
The Parity Trick
Unit Digit
Factorials
Prime Number
Factors and Prime Factorization
LCM and GCF
Calendar Problem
Clock (Time) Problem
Remainder
Modular Math
Counting
Simple Permutation
Casework
Constructive Counting
Complementary Counting
P.I.E.
How Many Whole Number Questions
Mean, Median and Mode
Counting Paths
Pigeonhole Principle
Simple Probability
Conditional Probability
Stars and Bars
Rotational Probability
Expected Values
Recursive Thinking (States)
Geometric Probability
Hockey Stick Identity
Permutation
Combinatorial Game Theory
Combination
Coloring the Checkerboard
Some Tricks
Resources
Remainder
202
5
AMC
8
Problem
6
2025 AMC 8 Problem 13
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