An isosceles traingle has a base of length 2m sides and length of square root 2. Determine the exact value of the apex angle in radius.

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  1. Sketch your triangle, draw in an altitude to see 2 congruent right-angled triangle
    Look at one them.
    It has a base of 1, a height of h and a hypotenuse of √2
    So you recognize the triangle? You should know this one.
    So what is the vertex angle?

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