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15. Let r be a positive real number. The equation for a circle of radius r whose center is the origin is x² + y² = r². dy (a) Use implicit differentiation to determine dx (b) Let (a, b) be a point on the circle with a # 0 and b # 0. Determine the slope of the line tangent to the circle at the point (a, b). (c) Prove that the radius of the circle to the point (a, b) is perpendicular to the line tangent to the circle at the point (a, b). Hint: Two lines (neither of which is horizontal) are perpendicular if and only if the products of their slopes is equal to –1.

15. Let r be a positive real number. The equation for a circle of radius r whose center is the origin is x² + y² = r². dy (a) Use implicit differentiation to determine dx (b) Let (a, b) be a point on the circle with a # 0 and b # 0. Determine the slope of the line tangent to the circle at the point (a, b). (c) Prove that the radius of the circle to the point (a, b) is perpendicular to the line tangent to the circle at the point (a, b). Hint: Two lines (neither of which is horizontal) are perpendicular if and only if the products of their slopes is equal to –1.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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15. Let r be a positive real number. The equation for a circle of radius r whose center is the origin is x² + y² = r². dy (a) Use implicit differentiation to determine dx (b) Let (a, b) be a point on the circle with a # 0 and b # 0. Determine the slope of the line tangent to the circle at the point (a, b). (c) Prove that the radius of the circle to the point (a, b) is perpendicular to the line tangent to the circle at the point (a, b). Hint: Two lines (neither of which is horizontal) are perpendicular if and only if the products of their slopes is equal to –1.
Transcribed Image Text:15. Let r be a positive real number. The equation for a circle of radius r whose center is the origin is x² + y² = r². dy (a) Use implicit differentiation to determine dx (b) Let (a, b) be a point on the circle with a # 0 and b # 0. Determine the slope of the line tangent to the circle at the point (a, b). (c) Prove that the radius of the circle to the point (a, b) is perpendicular to the line tangent to the circle at the point (a, b). Hint: Two lines (neither of which is horizontal) are perpendicular if and only if the products of their slopes is equal to –1.
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