tolong bantu menggunakan cara jangan dihapus ya karena app ini udah ga terlalu jelas apa apa dihapus.
Jawaban:
Area = Luas
point A
Luas lingkaran
[tex] = \pi {r}^{2} \\ = 3.14 \times 9 \times 9 \\ = 3.14 \times 81 \\ = 254.34 \: {cm}^{2} [/tex]
point B
Luas 1/4 lingkaran
[tex] = \frac{1}{4} \pi {r}^{2} \\ = \frac{1}{4} \times 3.14 \times 5 \times 5 \\ = \frac{1}{4} \times 3.14 \times 25 \\ = \frac{1}{4} \times 78.5 \\ = 19.625 \: {m}^{2} [/tex]
point C
Luas bangun datar gabungan
= Luas persegi panjang + Luas lingkaran
[tex] = (p \times l )+ ( \frac{1}{4} {\pi \: d}^{2} ) \\ = (4 \times 3) + ( \frac{1}{4} \times 3.14 \times3 \times 3) \\ = 12 + ( \frac{1}{4} \times 3.14 \times 9) \\ = 12 + ( \frac{1}{4} \times 28.26) \\ = 12 +7.065 \\ = 19.065 \: {cm}^{2} [/tex]
