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Alas sebenarnya= 5× 250= 1250 cm
Tinggi sebenarnya= 12×250= 3000 cm
Sisi miring sebenarnya = 13×250 = 3250 cm
Luas sebenarnya= 3000×1250 ÷ 2
= 1 875 000cm²
=187,5 m²
K= a+b+c
=3000+1250+3250
=7500 cm
=75m