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A=2 b=2 c=1 Find the value of 2abcosC

A=2 b=2 c=1 Find the value of 2abcosC
asked 34.0k views
5 votes
A=2 b=2 c=1 Find the value of 2abcosC

asked
User Christkv
by
7.8k points

1 Answer

2 votes

Answer:


2abCosC = 1

Explanation:

The cosine rule is

=>
a^2= b^2+c^2-2abCosC

For 2abCosC, it becomes

=>
2abCosC = b^2+c^2-a^2

=>
2abCosC = (2)^2+(1)^2-(2)^2

=>
2abCosC = 1

answered
User Avizzini
by
8.4k points
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