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Find Angle 'A' If : - Mathematics

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Question

Find angle 'A' if :

Sum

Solution

From the figure we have

cos A = `(10)/(20)`

cos A = `(1)/(2)`

cos A = cos 60°

A = 60°

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Solution of Right Triangles
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Chapter 24: Solution of Right Triangles [Simple 2-D Problems Involving One Right-angled Triangle] - Exercise 24 [Page 303]

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Selina Concise Mathematics [English] Class 9 ICSE
Chapter 24 Solution of Right Triangles [Simple 2-D Problems Involving One Right-angled Triangle]
Exercise 24 | Q 2.1 | Page 303
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