# 2x 2 y 2

Input interpretation |
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triangle | edge lengths 2×2 | 2 y | 2×2 |

Properties |

area | sqrt(-y^2 (y^2 – 16)) perimeter | 2 (y + 4) interior angles | ((180 cos^(-1)(y/4))/pi° | (180 cos^(-1)(1 – y^2/8))/pi° | (180 cos^(-1)(y/4))/pi°)~~(cos^(-1)(0.25 y) radians | cos^(-1)(1 – 0.125 y^2) radians | cos^(-1)(0.25 y) radians) interior angle sum | 180° = pi rad~~3.142 rad |