# What is the rotational symmetry of a windmill with 4 blades?

## What is the rotational symmetry of a windmill with 4 blades?

order 2×K
A windmill has four blades and rotational symmetry of the order 2×K.

## How do you know if its rotational symmetry?

A figure has rotational symmetry if it can be rotated by an angle between 0° and 360° so that the image coincides with the preimage. The angle of rotational symmetry is the smallest angle for which the figure can be rotated to coincide with itself.

What is rotational symmetry give examples?

Many shapes have rotational symmetry, such as rectangles, squares, circles, and all regular polygons. Choose an object and rotate it up to 180 degrees around its center. If at any point the object appears exactly like it did before the rotation, then the object has rotational symmetry.

### How many lines of symmetry does a windmill have?

Answer : Windmill is symmetrical , As is have rotational symmetry , So it does’t have any line of symmetry . It is impossible to fold it along a line so that any two half coincide .

### Which triangle has no line of symmetry?

scalene triangle
A scalene triangle has no lines of symmetry.

Which letter has no line of symmetry?

The letters of english alphabet have no line of symmetry are F, G, J, L, N, P, Q, R, S and Z.

## Does the letter D have rotational symmetry?

The (capital) letters A, B, C, D, E, H, I, K, L, M, O, T, U, V, W, X and Y (depending on how you draw it) all have at least one plane of reflection symmetry.

## What is order rotational symmetry?

The order of rotational symmetry of a shape is the number of times it can be rotated around a full circle and still look the same. If the triangle is rotated a full 360°, it never looks the same except when it arrives back at its original starting position.

Which triangle has 2 lines of symmetry?

No triangle has 2 lines of symmetry. Equilateral triangle has three lines of symmetry while an isosceles has one. A scalene triangle has none.

### What shape has no lines of symmetry?

Two shapes that have no lines of symmetry are the scalene triangle and an irregular quadrilateral.

### How does a paper windmill show rotational symmetry?

Paper windmill shows rotational symmetry. It is fixed to a stick by a pin. This pin is its center of rotation as its blades rotate around the pin. When we forcefully rotate it to an angle of 90° then we see despite the movement there is no change in its appearance. On further movement, the shape of the paper windmill is the same as the original.

When do we say that an object has rotational symmetry?

A half-turn means rotation by 180° a quarter-turn means rotation by 90°. Rotation may be clockwise or anticlockwise. If, after a rotation, an object looks exactly the same, we say that it has a rotational symmetry.

## What is the Order of symmetry of an object?

In a complete turn (of 360°), the number of times an object looks exactly the same is called the order of rotational symmetry. The order of symmetry of a square, for example, is 4 while, for an equilateral triangle, it is 3.

## What is the angle of rotation of a paper mill?

The angle at which this paper mill is turned is called the angle of rotation. Here the angle of turn is 90°. A full turn of rotation measures 360°. So for taking one full turn, our paper windmill is moved four times. Do you notice any change after a full turn?