Question

Sebuah lingkaran luasnya 1.386 cm2.Berapakah panjang jari-jari lingkaran tersebut?

Answer 1

Dik:
L = 1.386 cm²
Dit:
r = ... ?
Jawab:
L = π r²
1.386 = 22/7 r²
r² = 1.386×7/22
r² = 9.702/22
r² = 441
r = √441
r = 21 cm

Answer 2

Luas lingkaran =
1386 = 22/7. r^{2} [/tex]
1386/22 = /7
63.7 = r^2
441 = r^2

r = 21