Kerjain pake cara ya, buruan.
Penjelasan dengan langkah-langkah:
1) d = 42 cm
r = 21 cm
Kll = π x d
= 22/7 x 42
= 132 cm
L = π x r x r
= 22/7 x 21 x 21
= 1.386 cm²
2) d = 27 cm
r = 13,5 cm
Kll = π x d
= 22/7 x 27
= 84,85 cm = 85 cm
L = π x r x r
= 22/7 x 13,5 x 13,5
= 572,78 cm² = 573 cm²
3) d = 70 cm
r = 35 cm
Kll = π x d
= 22/7 x 70
= 220 cm
L = π x r x r
= 22/7 x 35 x 35
= 3.850 cm²
4) d = 56 cm
r = 28 cm
Kll = π x d
= 22/7 x 56
= 176 cm
L = π x r x r
= 22/7 x 28 x 28
= 2.464 cm²
5) r = 35 cm
d = 70 cm
Kll = π x d
= 22/7 x 70
= 220 cm
L = π x r x r
= 22/7 x 35 x 35
= 3.850 cm²
Semoga membantu dan tidak keliru
Penjelasan dengan langkah-langkah:
rumus yang ku pakai:
mencari keliling lingkaran jika diketahui diameternya: π x d
rumus luas lingkaran jika diketahui jari-jarinya: π x r x r
mencari diameter: r x 2
mencari jari-jari: d ÷ 2
1. luas:
π x r x r
= 22/7 x 21 x 21
= 22 x 3 x 21
= 1,386 cm2
keliling:
π x d
= 22/7 x 42
= 22 x 6
= 132 cm
2. luas:
π x r x r
3,14 x 13,5 x 13,5
= 3.14 x 182,25
= 572,265 cm2
keliling:
π x d
= 3,14 x 27
= 84,78 cm
3. luas:
π x r x r
= 22/7 x 35 x 35
= 22 x 5 x 35
= 3,850 cm2
keliling:
π x d
= 22/7 x 70
= 22 x 10
= 220 cm
4. luas:
π x r x r
= 22/7 x 28 x 28
= 22 z 4 x 28
= 2,464 cm2
5. luas:
π x r x r
= 22/7 x 35 x 35
= 22 x 5 x 35
= 3,850 cm2
keliling:
π x d
= 22/7 x 70
= 22 x 10
= 220 cm
Semoga membantu