C 3. Perhatikan gambar gabungan bangun datar berikut! berapakah luas gabungan bangun datar di samping
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Jawab:
Penjelasan dengan langkah-langkah:
Luas bagun datar = Luas 1/2 lingkaran + Luas persegi panjang + (2 x Luas segitiga siku siku)
Luas 1/2 lingkaran
= 1/2 x πr²
= 1/2 x π x 11 x 11
= 121π/2
Luas persegi panjang
= p x l
= 10 x 8
= 80 cm²
Luas 2 segitiga siku siku
= 2 x 1/2 x alas x tinggi
= 2 x 1/2 x 6 x 8
= 48 cm²
Luas = 48 + 80 + 121π/2 = 128 + 121π/2