S=a² ⇒ a=√S
S=d²/2=(5√2)²/2=25*2/2 м² = 25 м²
а=√25 = 5 см
P = 4 *a = 4*5 = 20
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S=a² ⇒ a=√S
S=d²/2=(5√2)²/2=25*2/2 м² = 25 м²
а=√25 = 5 см
P = 4 *a = 4*5 = 20