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(1 cm di peta = 400 cm)
Luas bangun sebenarnya
Luas A
= 15 cm X 30 cm
= 15(400) X 30(400)
= 6.000 X 12.000
= 72.000.000 cm
= 720 km
Luas B
= 10 cm X 14 cm
= 10(400) X 14(400)
= 4.000 X 5.600
= 22.400.000 cm
= 224 km
Luas C
= alas X tinggi / 2
= 400(√115) X 9(400)
= 400√115 X 3.600
= 720.000 √115 cm
= 0,72√115 km
Luas D
= 20 cm X 5 cm
= 20(400) X 5(400)
= 8.000 X 2.000
= 16.000.000 cm
= 160 km
Luas E
= alas X tinggi / 2
= 400(3√19) X 5(400) / 2
= 600√19 X 2.000
= 1.200.000 √19 cm
= 12 √19 km
Luas bangun sesungguhnya
= Luas A + B + C + D + E
= 720 + 224 + 0,72 √115 + 160 + 12 √19
= 1116,72 √115 + √19
= 1116,72 + 6,05 √19 + √19
= 1122,77 + 2√19
= 1124,77 + 4,36
= 1129,13 km
semoga bermanfaat :)