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=3,14 × 12² - 3,14 ×4²
=3,14 ×144 - 3,14 ×16
= 452,16 - 50, 24
=401,92
9. L= 1/2 lingkaran besar - 1/2 lingkaran kecil
= 1/2 × 22/7 ×14² - 1/2 ×22/7 ×7²
= 1/2 × 22/7 ×196- 1/2 ×22/7 ×49
=11 × 28 - 11 × 7
=308 - 77
=231