Math Problem Statement
Misalkan titik (a,b) terletak pada lingkaran x 2 + y 2 = r 2 . Tunjukkan bahwa garis ax + by = r 2 menyinggung lingkaran di titik (a,b).
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Analytic Geometry
Tangents
Circles
Formulas
Equation of a circle: x^2 + y^2 = r^2
Equation of a line: ax + by = r^2
Gradient product of perpendicular lines: m1 * m2 = -1
Theorems
The tangent to a circle is perpendicular to the radius at the point of tangency
Condition for tangency: the product of the gradients of the tangent and the radius is -1
Suitable Grade Level
Grades 10-12
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