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La nya kan belah ketupat : x d1 x d2
x 12 x 16 = 96
sisi tegak = 4 x = 312
96 + 312 = 408
ada jawabannya ga ? kalo salah mohon maaf , karna bisa ngitung alas segi empat , bukan Belah ketupat
La = 12 . 16 /2
La = 96 cm²
sisi belah ketupat = √6² + 8²
sisi belah ketupat = 10 cm
Ls = 4 . at /2
Ls = 4 . 10 . 13 /2
Ls = 260
Lp = La + Ls
Lp = 96 + 260
Lp = 356 cm²