Question

Tentukan keliling lingkaran jika diketahui
a. r=14 cm
b. r=10 cm
c. r=49 cm
d. r=50 cm

Answer 1

Rumus keliling lingkaran : π × Diameter
a. 22/7 × 2×14
=22/7x28
=22x4
=88cm

b.3,14×2×10
=3,14×20
=62,8cm

c.22/7×2×49
=22/7×98
=22×14
=308cm

d.3,14×2×50
=3,14×100
=314cm

Answer 2

A. =2×22/7×r
     =2×22/7×14
     =616/7
     =88 cm
b.=2×3,14×r
   =2×3,14×10
   =628 cm
c.=2×22/7×r
   =2×22/7×49
   =2156/7
   =308 cm
d. =2×3,14×r
    =2×3,14×50
    =314 cm