pakai cara yaa...thanks:)

Luas semua= 2.¾lingkaran + persegi panjang

1316 = 2.¾. 22/7. r² + 2r. r
1316 = 33/7r² + 2r²
1316 = (33/7+2)r²
1316 = (33/7+14/7)r²
1316 = 47/7.r²
1316.7/47 = r²
196 = r²
14 = r

Luas persegi = 2r.r
= 2.14. 14
= 392cm²