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= 1/2 × 45 × 30
= 45 × 15
= 675. D
14. l = π × r × r
= 22/7 × 14 × 14
= 22 × 2 × 7
= 616. A
2
= 45 x 30
2
= 1350
2
= 675 cm² ( d )
14. Jari - jari = diamenter : 2
= 28 : 2
= 14 cm
Luas lingkaran = π r²
= 22 x 14 x 14
7
= 22 x 2 x 14
= 616 cm² ( a )