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d=18cm
Ditanya L....?
L=1/4×π×d²
=1/4×3,14×18²
=254,34 cm²
ingatt ya
klo yg diket diameter rmusnya 1/4×π×d²
klo yg diket jari jari maka rumusnya π×r²
smgga bermnfaat
maka
3,14x9x9
3,14 x 81
254,34
maka luasnya 254,34 cm2
ingat, radius 9 cm asalnya dr diameter/2=18/2=9. oke?