luas lingkaran dengan diameter 14 cm adalah....cm2

luas lingkaran= 1/4πd²
=1/4×22/7×14²
=1/4×22/7×196
=1/4×22×28
=22×7
=154 cm²

L= π r²
= 22/7 x 7x 7
= 154 cm²

r= 1/2 d
= 1/2 14
= 7