What Is an Angle? Two Arms and One Vertex | Kids’ Geometry Song

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!