要用勾股定理做,谢谢
2014-12-04
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连接AM
∵MN是AB的垂直平分线,∴△AMN ≌ △BMN,∴MA = MB,∠B = ∠BAM
∵MB = 2MC,∴MA = 2MC,∴∠CAM = 30°,即∠CMA = 60°
∵∠CMA = ∠B + ∠BAM且∠B = ∠BAM,∴∠B = 30°,∴AB = 2AC = 16
∵MN是AB的垂直平分线,∴△AMN ≌ △BMN,∴MA = MB,∠B = ∠BAM
∵MB = 2MC,∴MA = 2MC,∴∠CAM = 30°,即∠CMA = 60°
∵∠CMA = ∠B + ∠BAM且∠B = ∠BAM,∴∠B = 30°,∴AB = 2AC = 16
2014-12-04
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