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Lingkaran: Pengenalan Interaktif

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Lingkaran: Pengenalan Interaktif

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About this activity

Pengenalan konsep lingkaran.

Created by

Anes Kholilah
Anes Kholilah
Indonesia

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Lingkaran: Pengenalan Interaktif
 

Lingkaran: Pengenalan InteraktifOnline version

Pengenalan konsep lingkaran.

by Anes Kholilah
1

Apa itu Lingkaran?

Lingkaran adalah himpunan titik-titik yang memiliki jarak tetap dari sebuah titik pusat. Jarak itu disebut jari-jari. Semua titik melingkari dengan simetri sempurna.
2

Titik Pusat, Jari-jari, Diameter

Titik pusat adalah pusat lingkaran. Jari-jari (r) adalah jarak dari pusat ke tepi. Diameter (d) adalah dua jari-jari, d = 2r, sepanjang lingkaran.
3

Jari-jari vs Diameter

Perbandingan umum: diameter sama dengan dua kali jari-jari (d = 2r). Jari-jari tetap untuk satu lingkaran yang sama.
4

Keliling Lingkaran

Keliling C adalah jarak keliling lingkaran. Rumus umum: C = 2πr = πd. Gunakan π ≈ 3,14 untuk perhitungan praktis.
5

Luas Lingkaran

Luas A lingkaran dihitung dengan A = πr^2. Semakin besar jari-jari, luas bertambah kuadrat terhadap r.
6

Rasio dan Pi

Pi adalah rasio keliling terhadap diameter pada lingkaran. Nilainya tak berhingga. Mendekati 3,14 atau 22/7 untuk perhitungan sederhana.
7

Contoh Hitung Jari-Jari

Jika keliling C = 31,4 cm, maka r = C/(2π) ≈ 31,4/(2×3,14) ≈ 5 cm. Sederhana namun penting.
8

Contoh Hitung Luas

Jika r = 5 cm, maka luas A = πr^2 ≈ 3,14×25 ≈ 78,5 cm². Perhatikan satuan area.
9

Kelas Lingkaran: Atributnya

Atribut utama: pusat, jari-jari, diameter, keliling, luas. Bentuknya sempurna simetris dengan sumbu sentral.
10

Aplikasi Sehari-hari

Roda, gelang, lantai melingkar, garis sirkular pada desain. Konsep lingkaran membantu perhitungan jarak dan luas area.
 
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