In obtuse-angled triangles the square on the side subtending the obtuse angle is greater than the squares on the sides containing the obtuse angle by twice the rectangle contained by one of the sides about the obtuse angle, namely that on which the perpendicular falls, and the straight line cut off outside by the perpendicular towards the obtuse angle.

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter2: Exponential, Logarithmic, And Trigonometric Functions
Section2.4: Trigonometric Functions
Problem 75E
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How do i show how this proposition are equivalent to the law of cosines?
In obtuse-angled triangles the square on the side subtending the obtuse angle is
greater than the squares on the sides containing the obtuse angle by twice the
rectangle contained by one of the sides about the obtuse angle, namely that on
which the perpendicular falls, and the straight line cut off outside by the
perpendicular towards the obtuse angle.
Transcribed Image Text:In obtuse-angled triangles the square on the side subtending the obtuse angle is greater than the squares on the sides containing the obtuse angle by twice the rectangle contained by one of the sides about the obtuse angle, namely that on which the perpendicular falls, and the straight line cut off outside by the perpendicular towards the obtuse angle.
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