Bantu cari kak, keliling sama luasnya, lingkaran
Keliling dan Luas
1. r = 24 cm
K.o = 2 x π x r
= 2 x 3,14 x 24
= 150,72 cm²
L.o = π x r²
= 3,14 x 24 x 24
= 1.808,64 cm²
2. r = 4,2 cm
K.o = 2 x π x r
= 2 x 3,14 x 4,2
= 26,376
= 26,4 cm²
L.o = π x r²
= 3,14 x 4,2 x 4,2
= 55,38 cm²
3. r = 40/2 = 20 cm
K.o = 2 x π x r
= 2 x 3,14 x 20
= 125,6 cm²
L.o = π x r²
= 3,14 x 20 x 20
= 1.256 cm²
4. r = 2,4/2 = 1,2
K.o = 2 x π x r
= 2 x 3,14 x 1,2
= 7,53 cm²
L.o = π x r²
= 3,14 x 1,2 x 1,2
= 4,52 cm²
Jawaban:
e. luas = 1.808,64 cm² keliling = 150,72 cm
f. luas = 55,3896 cm² keliling = 26,376 cm
g. luas = 1.256 cm² keliling = 125,6 cm
h. luas = 4,5216 cm² keliling = 7,536 cm
Penjelasan dengan langkah-langkah:
e.
luas =
πr²
3,14 × 24 × 24
1.808,64 cm²
keliling =
2πr
2 × 3,14 × 24
6,28 × 24
150,72 cm
f.
luas =
πr²
3,14 × 4,2 × 4,2
55,3896 cm²
keliling =
2πr
2 × 3,14 × 4,2
26,376 cm
g.
luas =
πr²
3,14 × 20 × 20
1.256 cm²
keliling =
2πr
2 × 3,14 × 20
125,6 cm
h.
luas =
πr²
3,14 × 1,2 × 1,2
4,5216 cm²
keliling =
2πr
2 × 3,14 × 1,2
7,536 cm