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200 = 4s
s = 50
Phytagoras
√50^ - (80:2)^
√50^ - 40^
√900 = 30
D1 = 80cm
D2 = 30 × 2 = 60cm
d1 = 80cm.
d2= ?
r1 = 40cm.
K= 4s
200 cm = 4s
s = 50 cm.
s² = r1²+r2²
50² = 40²+r2²
2500 = 1600 + r2²
r2² = 900
r2 = 30 cm
d2 = 2 ×r2
= 60 cm.
Jadi, diagonal yg lain adalah 60 cm.