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K = 4s = 68
s = 68/4
s = 17 cm
d1= 16 cm (ini mungkin maksudmu dm kali ya? Soalnya nggak mungkin kalau cm:3)
d2 =?
Memakai triple pytagoras, kita mendapatkan :
S²= (1/2d1)² + (1/2d2)²
17² = (1/2 x 16)² + (1/2d2)²
289 = 64 + (1/2 d2)²
(1/2d2)² = 289 - 64
= 225
(1/2d2) = 15
d2 = 15 x 2
= 30 dm
Semoga membantu :)