Jika jari jari lingkaran besar 30 cm, hitunglah luas bangun datar di atas!
Jawab:
Jawab:
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2.394,25 cm²
Penjelasan dengan langkah-langkah:
d lingkaran kecil = 2 x 30 - 2 x 5
= 60 - 10
= 50 cm
r ling kecil = 50 : 2 = 25 cm
L = 1/2 L.lingkaran besar + 1/2 L kecil
= 1/2 x 3,14 x 30 x 30 + 1/2 x 3,14 x 25 x 25
= 1.413 + 981,25
= 2.394,25 cm²