Question

Tolong di bantu soal nomor 6, dan 7

Answer 1

6.
a.
L = πr²
200,96 = 3,14Xr²
r² = 200,96/3,14
r² = 64
r = √64
r = 8

K = 2πr
K = 2 X 3,14 X 8
K = 16 X 3,14
K = 50,24 cm

b.
L = πr²
1.256 = 3,14 X r²
r² = 1.256/3,14
r² = 400
r = √400
r = 20

K = 2 X 3,14 X 20
K = 40 X 3,14
K = 125,6 cm

7.
a.
K = 2πr
88 = 2 X 3,14 r
88 = 6,28 r
r = 88/6,28
r = 14,01
r = 14
L = πr²
L = 22/7 (14)²
L = 22/7 X 196
L = 22 X 28
L = 616 cm²

b.
K = 2πr
94,2 = 2 X 3,14 r
94,2 = 6,28 r
r = 94,2 / 6,28
r = 15
L = πr²
L = 3,14 X (15)
L = 3,14 X 225
L = 706,5 cm²

c.
K = 2πr
188,4 = 2 X 3,14 r
188,4 = 6,28 r
r = 188,4 / 6,28
r = 30
L = πr²
L = 3,14 (30)²
L = 3,14 X 900
L= 2.826 cm²

Maaf, kalau ada yang salah.