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Verified answer
Luas semua bangun= 2 ( 22/7 × 14²) + 28²
= 2 (616) + 784
= 1232 + 784
= 2016 cm²
luas lingkaran tengah
jari²= ½ diagonal sisi
½ ds = s√2 / 2
= 28√2 / 2
= 14√2 cm
L = 22/7 × (14√2)²
L = 22/7 × 392
L = 1232 cm²
Luas yang diarsir
= luas semua - luas lingkaran tengah
= 2016 cm² - 1232 cm²
= 784 cm²
Keliling semua bangun
= 2 (22/7 × 28) + 4 (28)
= 2 (88) + 112
= 176 + 112
= 288 cm
keliling lingkaran tengah
= 22/7 × 28√2
= 88√2 cm
Keliling yang diarsir
= 288 cm - 88√2 cm
= 163,5 cm
Verified answer
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