Question

if a=2cm, b=3cm and c=4cm, then find Cos A​

Answer 1

Answer:

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Answer 2

Answer:

Answer:

The required answer is " cosA= 21/24 "

Explanation:

Given that

a = 2 cm, b = 3 cm, c = 4 cm

We know that

\begin{gathered}cosA=\frac{b^{2}+c^{2}-a^{2}}{2bc}\\ \\cosA=\frac{3^{2}+4^{2}-2^{2}}{2(3)(4)}\\\\cosA=\frac{9+16-4}{24}\\\\cosA=\frac{9+16-4}{24}\\\\cosA=\frac{21}{24}\\\end{gathered}

cosA=

2bc

b

2

+c

2

−a

2

cosA=

2(3)(4)

3

2

+4

2

−2

2

cosA=

24

9+16−4

cosA=

24

9+16−4

cosA=

24

21

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