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D(2, 1)
AB的斜率: (2-0)/(0-4) = -1/2
CD的斜率: -/(-1/2) = 2
CD的方程: y - 1 = 2(x-2), y = 2x - 3
y = 0, x = 3/2
C(3/2, 0)
△AOC的周长=OA + OC + AC
= 2 + 3/2 + √(OA² + OC²)
= 7/2 + √[2² + (3/2)²]
= 7/2 + 5/2
= 6
AB的斜率: (2-0)/(0-4) = -1/2
CD的斜率: -/(-1/2) = 2
CD的方程: y - 1 = 2(x-2), y = 2x - 3
y = 0, x = 3/2
C(3/2, 0)
△AOC的周长=OA + OC + AC
= 2 + 3/2 + √(OA² + OC²)
= 7/2 + √[2² + (3/2)²]
= 7/2 + 5/2
= 6
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