help me pls geometry

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Which tirangles must be similar
1. Two right triangles with a congruent acute angle
2. Two obtuse angles
3 Two isosceles triangles with congruent bases
4. Two scalene triangles with a congruent angle

  • help me pls geometry -

    #1. If the acute angle is equal, then all the angles are equal.

  • help me pls geometry -

    After drawing four squares, Chen completed this chart showing the length of the sides of each square and the area of each square. According to Chen’s chart, if A is the area and s is the length of a side, what can you conclude is the formula for the area of a square?

    Side Length Area
    1 1
    2 4
    3 9
    4 16

  • help me pls geometry -

    A=s^2

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