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正三棱錐側棱長都相等,所以側面都是等腰三角形,側面又都是直角三角形 所以側面都是等腰直角三角形,頂角為直角 底面邊長為a 所以等腰直角三角形斜邊=a 直角邊=√2/2a 一個側面面積S1=1/2*√2/2a*√2/2a=a^2/4 該三棱錐的側面積是=3a^2/4
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