 # Quick Answer: How Do You Work Out Line Of Symmetry?

## What does a symmetry line look like?

We say there is symmetry when the exact reflection or mirror image of a line, shape or object gets created.

The line of symmetry can be defined as the axis or imaginary line that passes through the center of the shape or object and divides it into identical halves..

## Which shape has 2 lines of symmetry?

rectangleA shape can have more than one line of symmetry. Thus a rectangle has two lines of symmetry, an equilateral triangle has three lines of symmetry, and a square has four. A circle has an infinite number of lines of symmetry since it can be folded about any diameter.

## Can the axis of symmetry be negative?

When a<0, the parabola opens downward. When a=0, the graph is not a parabola but a line. In a parabola the axis of symmetry is x= -b/2a. ... When 'a' was positive the axis of symmetry was negative, and when a was negative the axis of symmetry was positive.

## What is the axis of symmetry examples?

The two sides of a graph on either side of the axis of symmetry look like mirror images of each other. Example: This is a graph of the parabola y = x2 – 4x + 2 together with its axis of symmetry x = 2. The axis of symmetry is the red vertical line.

## How do you convert from standard form to vertex form on a calculator?

Vertex form to standard form converterWrite the parabola equation in the vertex form: y = a*(x-h)² + k ;Expand the expression in the bracket: y = a*(x² – 2*h*x + h²) + k ;Multiply the terms in the parenthesis by a : y = a*x² – 2*a*h*x + a*h² + k ;More items…

## Where is the vertex on a graph?

The vertex of a parabola is the point where the parabola crosses its axis of symmetry. If the coefficient of the x2 term is positive, the vertex will be the lowest point on the graph, the point at the bottom of the “ U ”-shape.

## How do you solve a parabola equation?

Sketching ParabolasFind the vertex. We’ll discuss how to find this shortly. … Find the y -intercept, (0,f(0)) ( 0 , f ( 0 ) ) .Solve f(x)=0 f ( x ) = 0 to find the x coordinates of the x -intercepts if they exist. … Make sure that you’ve got at least one point to either side of the vertex. … Sketch the graph.

## How much lines of symmetry does a have?

The rest of the letters, A, B, C, D, and E all have only 1 line of symmetry. Notice that the A has a vertical line of symmetry, while the B, C, D, and E have a horizontal line of symmetry. Let’s look at some more letters!

## What are the 4 types of symmetry?

The four main types of this symmetry are translation, rotation, reflection, and glide reflection.

## What is the formula to find the axis of symmetry?

If the vertex of a parabola is (k,l), then its axis of symmetry has equation x=k. We can find a simple formula for the value of k in terms of the coefficients of the quadratic. As usual, we complete the square: y=ax2+bx+c=a[x2+bax+ca]=a[(x+b2a)2+ca−(b2a)2].

## What is a line of symmetry in math?

A line of symmetry is a line that cuts a shape exactly in half. This means that if you were to fold the shape along the line, both halves would match exactly. Equally, if you were to place a mirror along the line, the shape would remain unchanged. … An equilateral triangle has 3 lines of symmetry.

## Which shape has only one line of symmetry?

Kite. A kite has one line of symmetry. It has rotational symmetry of order one.

## How do you find the equation of the line of symmetry for a parabola?

When a quadratic function is graphed in the coordinate plane, the resulting parabola and corresponding axis of symmetry are vertical. The graph of the parabola represented by the quadratic function y = a( x – p )2 + q has an axis of symmetry represented by the equation of the vertical line x = p.

## What is the meaning of axis of symmetry?

An axis of symmetry is a line about which a figure is symmetrical. If a figure can be folded such that the two parts exactly match, the fold line is an axis of symmetry.