Penjelasan dengan langkah-langkah:
39.
cari dlu panjang diagonal 2 pada belah ketupat
= √13² - 5²
= √169 - 25
= √144
= 12
nah :
L = l. persegi panjang + l. belah ketupat
L = p × l + 1/2 × d1 × d2
L = 40 × 10 + 1/2 × 10 × 24
L = 400 + 10 × 12
L = 400 + 120
L = 520 cm² (d)
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