Matematika
English
Two arms, one vertex—make an angle
A catchy cardboard-crocodile song shows how two angle arms begin at one shared vertex. Children discover that an angle changes when the arms turn, while shortening an arm without turning it leaves the angle unchanged.
Dengarkan
Pilih platform lalu gunakan tombol putar pada pemutarnya.
Pemutaran bergantung pada platform, akun, dan peramban. Pratinjau lagu mungkin tersedia.
Teks dari subtitel rekaman ini.
Lirik lagu
What made this cardboard crocodile click?
Lena cuts two brightly colored strips.
A round rivet joins them at one end.
Click—both strips can turn around the dot.
She moves one strip; the jaws open wide.
Both angle arms start at that same dot.
That shared starting point is the vertex.
Two arms, one vertex—make an angle.
Spread them wider; the angle grows.
Bring them closer; it gets smaller.
The arms' directions set its size.
A small paper fish fits a narrow gap.
The big fish needs the jaws open wider.
Lena spreads the arms; the angle grows.
She brings them closer; it gets smaller.
For the big fish, she opens just right.
Two arms, one vertex—make an angle.
Spread them wider; the angle grows.
Bring them closer; it gets smaller.
The arms' directions set its size.
Each angle arm is called a ray.
From the vertex, it continues one way.
Cardboard shows just part of that ray.
Shorten the strip, don't turn it: same angle.
Two arms, one vertex—make an angle.
Spread them wider; the angle grows.
Bring them closer; it gets smaller.
The arms' directions set its size.
Big fish fits; the jaws are open just right.
Two arms, one vertex—angle found!
Lirik versi bahasa ini
Apa yang berbunyi klik di buaya karton?
Lena memotong dua pita berwarna.
Paku keling bulat menyatukan ujungnya.
Klik, keduanya berputar di titik itu.
Lena menggerakkan satu; mulut terbuka.
Dua kaki sudut berawal di titik sama.
Awal bersama itu disebut titik sudut.
Dua kaki, satu titik sudut—itulah sudut.
Renggangkan, sudut membesar.
Dekatkan, sudut mengecil.
Arah kedua kaki menentukan besarnya.
Ikan kertas kecil muat di celah sempit.
Yang besar perlu mulut lebih terbuka.
Lena merenggangkan kaki; sudut membesar.
Saat didekatkan, sudut mengecil.
Untuk ikan besar, bukaannya pas.
Dua kaki, satu titik sudut—itulah sudut.
Renggangkan, sudut membesar.
Dekatkan, sudut mengecil.
Arah kedua kaki menentukan besarnya.
Setiap kaki sudut ialah sinar garis.
Berawal di titik sudut, terus searah.
Karton hanya menunjukkan sebagiannya.
Pita diperpendek, tak diputar: sudut tetap.
Dua kaki, satu titik sudut—itulah sudut.
Renggangkan, sudut membesar.
Dekatkan, sudut mengecil.
Arah kedua kaki menentukan besarnya.
Ikan besar masuk; bukaan mulut pas.
Dua kaki, satu titik sudut—sudut ditemukan!