luasnya ............ cm2

Diameter (D) = 40 ÷ 2 = 20

Rumus lingkaran :

Luas lingkaran
= [tex]\pi \times r ^{2} \times r ^{2} [/tex]
= 3,14 × 20 × 20 × 1/2
= 3.14 × 400 × 1/2
= 1.256 cm^2 × 1/2
= 628 cm^2 (B)

Semoga membantu

1/2Lingkaran dengan diameter=40cm
r = 1/2×d
r = 20 cm

L =1/2 × (phi × r × r)
L = 1/2 × (3,14 × 20 × 20)
L = 628 cm^2

#CMIIW