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2. Find the difference between the largest and smallest angles of a triangle if the lengths of sides are 10, 19 and 23.

Solution

The angle opposite to the largest side is the largest angle. (...a=23(largest))
\ Ð A is the largest angle.

Thus, the difference between the largest and smallest angles is 1000 18' - 250.20' = 740 58'


3. If in DABC, a=4, b = 5 and c = 6. Show that Ð C = 2 Ð A

Solution

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Index

3. 1 Solving Right Triangles
3. 2 Law of Cosines
3. 3 Law of Sines
3. 4 The Ambiguous Case of Law of Sines
3. 5 Areas of Triangles
Supplementary Problems

Chapter 4





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