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Jadi
diagonal1 = 12 + 12 = 24
diagonal2 = 5 + 5 = 10
Luas segitiga = × a × t
= × 12 × 5
= 30 cm²
Luas persegi panjang = p × l
= 40 cm × 10 cm
= 400cm²
Luas belah ketupat = × diagonal1 × diagonal2
= × 24 × 10
= 120 cm²
Luas keseluruhan = 400 cm² - 30cm² + 120cm² - 30²
= 370cm² + 90cm²
= 460cm² (c)
L 3 segitiga kecil = 3. 1/2 . 12 .5
=3/2.60 = 90 cm²
L seluruh nya = 400 + 90 = 490 cm²,
gitu, tapi di option nya ga ada jawaban nya..