Question

Tentukan keliling dan luas lingkaran tersebut
A . r = 9 cm
B. d = 4 cm
C. d = 10 cm

Answer 1

K = π x 2 x r
k = π x d

L = π x r²
L = π x d² x 1/4

a. r = 9
k = 3,14 x 2 x 9 = 56,52
l = 3,14 x 9 x 9 = 254,34

b. d = 4
k = 3,14 x 4 = 12,56
l = 3,14 x 4 x 4 x 1/4 = 12,56

c. d = 10
k = 3,14 x 10 = 31,4
l = 3,14 x 10 x 10 x 1/4 = 78,5

Answer 2

A. K = π . d = 3,14 . 18 = …
L = π . r² = 3,14 . 9² = 3,14 . 81 = …

b. K = π . d = 3,14 . 4 = …
L = π . r² = 3,14 . 2² = …

c. K = π . d = 3,14 . 10 = 31,4
L = π . r² = 3,14 . 5² = …

(mohon dihitung sendiri)