設O為座標原點。A(-R, 0), B(x, y), D(0, z), 得四個方程
x^2 + y^2 = R^2
(x+R)^2 + y^2 = 24^2
R^2 + z^2 = 25^2
x^2 + (y-z)^2 = 7^2
解出z,就是所求。
從B作AO的垂線,這也是一個完全用勾股定理的幾何解。
設O為座標原點。A(-R, 0), B(x, y), D(0, z), 得四個方程
x^2 + y^2 = R^2
(x+R)^2 + y^2 = 24^2
R^2 + z^2 = 25^2
x^2 + (y-z)^2 = 7^2
解出z,就是所求。
從B作AO的垂線,這也是一個完全用勾股定理的幾何解。
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