Question

Hitunglah diameter lingkaran yang luasnya sebagai berikut
a. 28,26 cm²
b. 113,04 cm²
c. 330 cm²
d. 176 cm².

pakai cara nya yaa.. trima kasih

Answer 1

A. Luas = 28,26
Luas = x
28,26 = 3,14 x
= 28,26 : 3,14
= 9
r = = 3 cm
diameter = 2 x r = 2 x 3 = 6 cm

b. Luas = 113,04
Luas = x
113,04 = 3,14 x
= 113,04 : 3,14
= 36
r = = 6 cm
diameter = 2 x r = 2 x 6 = 12 cm

c. Luas = 330
Luas = x
330 = x
= 330 :
= 330 x
= 105
r = = 10,25 cm
diameter = 2 x r = 2 x 10,25 = 20,5 cm

d. Luas = 176
Luas = x
176 = x
= 176 :
= 176 x
= 56
r = = 7,48 cm
diameter = 2 x r = 2 x 7,48 = 14,96 cm