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(10x10) - (4x4)
100-16= 84
maaf klo salah
= 40-24
= 16 cm
b. itu yg d ujung panjangnya 6 kan?!
K = 25 + 3X6 + 4X18 + 2X7 + 2X25
= 25 + 18 + 72 + 14 + 50
= 179 cm