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Luas trapesium = \frac{50 + 110}{2} × 40 cm =
=160 cm / 2 × 40 cm =
= 80 cm × 40 cm = 3200 cm2
Luas belah ketupat = 40 cm × 30 cm / 2 =
= 1200 cm / 2 =
= 600 cm2
3200 cm2 - 600 cm2 = 2600 cm2
Jadi luas daerah yang diarsir adalah 2600 cm2
Maaf kalau salah :)