10x 3y 15

10x 3y 15

Input interpretation
triangle | edge lengths 3×10 | 10 y | 10×15
Properties
area | 25 sqrt(-y^4 + 468 y^2 – 46656)
perimeter | 10 (y + 18)
interior angles | ((180 cos^(-1)((y^2 + 216)/(30 y)))/pi° | (180 cos^(-1)(13/5 – y^2/90))/pi° | (180 cos^(-1)(y/6 – 36/y))/pi°)~~(cos^(-1)((0.0333333 (y^2 + 216))/y) radians | cos^(-1)(2.6 – 0.0111111 y^2) radians | cos^(-1)(0.166667 y – 36/y) radians)
interior angle sum | 180° = pi rad~~3.142 rad

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