Find the angles of isosceles triangles and scalene if given the sides?

I need a pillow hold with a degree angle 30-35. Are marketed under the proposed measure only angles. How I can not find the pillows measuring angles: (1) 7 x 24 x 24 (2) 12 x 24 x 24 (3) 10 x 12 x 18

For 7 x 24 x 24 triangle, base = 7 and the lateral inclination = cos 24 => (base angle) = 3.5/24 => every angle base = 81.6 ° (approximately) angle> tip = 180 2 * 81.6 = 16.8 degrees.

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