d=12 дм
d²=a²+a²=2a²
12²=2a²
144=2a²
a²=72
S=a²⇒S=72дм²
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d=12 дм
d²=a²+a²=2a²
12²=2a²
144=2a²
a²=72
S=a²⇒S=72дм²