[img]data:image/png;base64,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[/img][br][img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAANoAAABWCAYAAACpb4h4AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAmkSURBVHhe7Z3JixQ/G8fjexfXkwcPLgdRUNxxAwUdEQ8KouJBBEVxwYPgjgdxQcWTuKMXwV1vjriAHlxwZwTFi4oIenL3D5i3P+l6xvzK6plq7co43d8PFOlKUtXTSb6V5MlTmW6tJZwQolD+l4RCiAKR0ISIgIQmRAQkNCEiIKEJEQEJTYgISGhCREBCEyICEpoQEZDQhIiAhCZEBCQ0ISIgoQkRAQlNiAhIaEJEQEITIgISmhARkNCEiICEJkQEJDQhIiChiYpcvXrVzZw503Xr1s0fq1atcp8/f05SRTVIaKIiBw4ccNOmTXNslNbS0uKOHDnibt68maSKatB2cyI39GrNzc1u1qxZSYzIi4QmOuTt27du//79rlevXm7Xrl1JrKgGDR1Fu+zbt88NHDjQ3bhxw/Xo0UNztD9EQmtAnj9/7gYNGuR69+7t7t696+MQEIYP4g3ybdiwwc/RLl++7I4fP+4uXbqUpIpqkNAakGPHjrmHDx/6nurgwYM+bvXq1W7v3r3u9evX/hw2btzoezTo3r27D8UfwhxNNCYlYbWWxNZ69OjR1ubm5iT2F8SNHj2aOXxraX7WunLlytZPnz4lqaIaZAxpYBg2Tp482ZUE5A4fPpzEiiLQ0LGB6devnw9nz57tQ1EcEloDc/LkST9Pe/HiRRIjikJCa1AYNmKunzFjhrt161YSK4pCQmtAMNvv3LnTm+6HDx/url+/7s378mUsDgmtwRgzZoxbtmyZO336tD+fN2+e9/gYPHiwmzJliuvTp4+PbwR44CxcuNCvJ+JexjoicUUgq6NoWFgjfPbsmTt06JA/HzdunB9KF2GB/Wd7NDwU7CkjRB7ojWgz586dS2Lah6EzeenFOWhz9O5FUDOh8SOtC+bYunVrkvJ7Wp6CwEMBi1hXgjmO/UYqLRyGpNNE7Xn16pUPhwwZ4sO8MC/FWwbWrVvnw5rD0LFW3Llzx3sRNDU1JTG/sDTCvHCfrHv9y/D3VvqdXfH31AN4wODhkoW1S/N8efPmTZJSW2o6dJw0aZLvhbIsVy9fvvRp5KlnlixZ4sMfP374MOTRo0dt6SIOjCr27Nnj515peP2H3q+kA/fkyRP35csXt2XLliS1ttR8jrZgwQL/R/MjQk6cOOHWr1+fnJXXcbCA2XAK60/6mjTkIW84b7MhWaU4CpqQcxvOZcWF8KBg6Btao/KavadPn+7DK1eu+NBgWwDgNzQyVrbpOgOGb8RbO+CcOqCOuI564jN5zNnZII4jnLJQ1iNGjHBfv351u3fvbstj8CYCztTcmzXFQil3bLUDR1Rue/bs2SSm1XfHxJlDqnXXOLMC6XTtOLiGTqtZQy2uS8dxbVYc9ys9ofw9W1pa/PCA+HRc6eGQXFWGe5GPv4t8WX9He9h3hzAs4XsbHcqA+mc4l25+lJGVG+2H9hG2Fas3wvS1We0OOCc+a0hI/VP3pHPwmbgiqLnQIN14KaTwnM/phmsFGhZUVgMnTzouKx/n6cZOHNenxRzmo6DJE3qzWyXmrQR+bzo/ZZLneq7Le3RlEBplEsIDKmwnYO0ijM8SqeVLCwpRpttBZ1CIeZ8u+/z588lZedi4ePHi5Mz5NDZ9CbG52/v3731YCypZ99KLsqXKST457yUB4b4YrK/Ahw8ffNgRNny0ezFsLFW298LoiFKd5D4qYUOkzjrygNvX2LFjk7MyTDmmTp2anJVhbg9r1qzxIbD2VRJlclbm/v373jQ/YMCAJKbM06dPf8vbGRQiNPMGp4ExrqYhd7UNXcKG07dvXx+X1/mWyqZyL1686M9PnTrlvTFikSXKmEceeAiFD1t703vo0KE+NG7fvu3LMjSiIci0cQPxpYULfM/IkSOTs86jEKFZD3Dv3j134cIF/75TVyOrAbHAmRcaghmF6MFxdcpDKPCOjq6KGZ8mTJjgQzhz5owP01ZpyhCjmUF58uCeOHFiElOGPU3SoyQTb/g9nUUhQmNoVhpT+wbGsXTp0iSlTPi0N6zwhw0b5sNKlOZUyadf5LUI5sG+P22JrJb58+f7EAsoD5q8PoRZAq90dFUePHjgQxMVZY0TQ3qIR70iqnDIzRIJ2MMcuB7LYlpQNuysdgG7CAoRGsyZM8cXUta4efv27f5JZavxPKUYWlHQ4RAT75C0iHr27OkLm8IlDXMu35POx3m4/wVYnjBvOo7vZz7F32NmZr4rXH7AtNxRj0Lj4D4MXfRiZTaUKwd7k9iyB/Vgn9nXBMaPH+9DCOfwPMSok58/fyYx5SWBtOcRHiPkC+swOqUnYyGUGr+3AqXNrQbxWIPIg/UJ025oDcTKRBoHaQaWO7sOiyHnZk20fIR2rVmrzBLIwfWV4oB7ht/P59BimGX1yoK/I7xvV8V+b96jI2gbVodW72bZtTqFrHImjfbC9WYZ5nrOiecag/jSw9vfg7BSW4yBvPf/ABZaR40a1TCbiTJHYgqQHpmI/BQ2dKxXGJY0ksgYyjH/kcj+DvVool1YosF6rK3A/w71aA0AvRJGAoaA+A5WYxDAZzM0pXMvenXzFeXgvmZKFxWgRxP1C8YDDAEYGUK3srxgZMgyUmFIAjNsYIgI84n/oh6tjqH3waWJHufatWtVe+dgeseNLVwD/Pbtm18XXLFihT9n7rZ8+XI/j7MXL8XvSGh1zLZt23y4Y8cOH1YLC8tz585NzsogWO1qXD0SWp3CPIz/0Env05FXCnmz5m34GYaLxZV49+6dd0z4Fzww/lUktDrF/gUuLzTiEWGGC4wYDAkBAwZppTmW/0eDafAf7OiNA+6FoOnl8rqZNSISWp3y/ft3H+LVvnnzZoxe3lUNt7TwTQLePKbXQyzM6QzM+uYKVQnycy+u7yhvoyOh1TmY4q1XwnDBdhL2VgFOvcQtWrTIp7MXv8HaGRuqtge9I4YWzdk6RkJrMOx9r48fP/oQEFxTU5PfxMbA5cpeYM0Ch16GihJZPiS0OqV///4+tE2BjEqvjqxdu9ab6OkB6e0wblSac7H4/fjx47ZtxYHvSW+YIwLKy2miHmGhmoNFZWBfDRaWK20SxMKzeblXymNvZYRvMwAL2aHnvPgvElodgyjC130QUntiQGCWD1FmwWstdr/0IaFVRk7Fog2siPxXGWAzUVE7NEcTbTAn27RpU+auvuLvUI8mRATUowkRAQlNiAhIaEJEQEITIgISmhARkNCEiICEJkQEJDQhIiChCREBCU2ICEhoQkRAQhMiAhKaEBGQ0ISIgIQmRAQkNCEiIKEJEQEJTYgISGhCFI5z/werk9J7YktpkwAAAABJRU5ErkJggg==[/img][br]where x is the edge length of the teterahedron.
[u][color=#0000ff]https://www.geogebra.org/classic/f8nsktju[/color][/u]