hitunglah luas lingkaran jika jari jarinya 7 cm dan diameternya 20 cm

Please, let me answer your question :)
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Mapel : Matematika
Tentang : Bangun Datar
Pertanyaan yg diajukan : 2
Pembahasan :

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Diketahui :
- Jari - jari (r) : 7 cm

Ditanya :
- Luas (L)

L = π x r²
L = 22/7 x 7 x 7
L = 22 x 7
L = 154 cm²

Jawaban : 154 cm²

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Diketahui :
- Diameter (d) : 20 cm
- Jari - jari (r) : 20 : 2 = 10 cm

Ditanya :
- Luas

L = π x r²
L = 3,14 x 10 x 10
L = 31,4 x 10
L = 314 cm²

Jawaban : 314 cm²

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Hopefully this is the best for you.

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Heil Manstein!