If a-b and c are vectors such that a-b-c-0- and -a-7-b-5 and -c-3- then angle between b- and c- is

Given #160; a⃗+b⃗+c⃗ = o⃗ | a⃗ | = 7, | b⃗ | = 5, | c⃗ | = 3 b⃗+c⃗ = ⃗a⃗⇒ | b⃗+c⃗ | = | a⃗ | | b⃗ |^2+ | c⃗ |^2+ | b⃗ | | c⃗ |cosθ = | a⃗ |^ ...

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Comparing Vectors

If a,b and ...

Question

If $a, b$ and $c$ are vectors such that $\to a + \to b + \to c = \to 0$ and $| \to a | = 7, | \to b | = 5$ and $| \to c | = 3$ , then angle between $\to b$ and $\to c$ is

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