| The largest angle of an obtuse triangle is more than 90 degrees, and the largest angle of an acute triangle is less than 90 degrees. |
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| The original shape of the Hall sides represents an isosceles acute triangle on whose vertex the Hall contact is formed. |
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| This is illustrated as an acute triangle beside the two cameras in Figures 1 and 3, and its geometry is determined by the length of the camera unit and the parameters of image combination. |
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| It forms an extremely acute triangle of claimed seabed. |
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