Question

Luas lingkaran 1,54 dm².
Diameternya = ... Cm. Luasnya desi meter ya..

Answer 1

Luas = 1,54 dm² = 154 cm²

luas = pi × r²
154 = 22/7 × r²
r² = 154 : 22/7
r² = 154 × 7/22
r² = 49
r = √49
r = 7 cm

diameter = 2r
diameter = 2(7)
diameter = 14 cm

Answer 2

Diket luas lingkarang =1,54 dm2= 154 cm2
dit d...?
luas lingkarang= phi x r2
154= 22/7 x r2
154 x7 =r2
   22   
49 = r2
akar 49 = r
7 cm =r
d= 2xr
=2x7
=14 cm