diameter seperempat lingkaran 7cm luas =

r = 7 : 2 = 3,5 cm

[tex]luas \: = \frac{1}{4} \pi {r}^{2} [/tex]
= 1/4 × 22/7 × 3,5 × 3,5
= 77/8
= 9,6 cm^2

Diameter 1/4 lingkaran = 7cm
Diameter 1 lingkaran = 7 x 4
= 28
Jari jari lingkaran = 28 ÷ 2
=14
L = 22/7 x 14 x 14
=44 x 14
= 616