K = 4 x s
40 = 4 x s
s = 10 cm
(1/2d2)² = s² - (1/2 x d1)²
(1/2d2)² = 10² - (1/2 x 16)²
(1/2d2)² = 100 - 64
(1/2d2)² = 36
1/2d2 = √36
1/2d2 = 6
d2 = 12 cm (C)
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K = 4 x s
40 = 4 x s
s = 10 cm
(1/2d2)² = s² - (1/2 x d1)²
(1/2d2)² = 10² - (1/2 x 16)²
(1/2d2)² = 100 - 64
(1/2d2)² = 36
1/2d2 = √36
1/2d2 = 6
d2 = 12 cm (C)