Tolong di jawab nomer 26

Bab Bangun Datar

2 × 3/4 luas lingkaran + luas persegi = luas gabungan
3/2 × 22/7 × r^2 + r^2 = 320
33/7 × r^2 + 7/7 × r^2 = 320
40/7 × r^2 = 320
r^2 = 320 × 7/40
r^2 = 8 × 7
r^2 = 56 cm^2