Practice Symmetry (Meta) in Math

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Quick Recap

A property of a mathematical object that remains unchanged under a specified transformation — reflection, rotation, translation, or algebraic substitution.

Looks the same from different perspectives or after certain changes.

Showing a random 20 of 50 problems.

Example 1

easy
Across which axis is the parabola y=(x−3)2 symmetric?

Example 2

hard
The number of symmetries (rotations + reflections) of a regular n-gon is _____.

Example 3

easy
Show that the equation x2+y2=25 is symmetric about both coordinate axes and the origin. Verify by substituting (x,y)=(3,4) and its reflections.

Example 4

easy
Is f(x)=x3 an even or odd function?

Example 5

medium
Use symmetry to find the sum of the roots of x2−6x+5=0 without factoring fully.

Example 6

easy
How many degrees of rotational symmetry (smallest positive rotation) does an equilateral triangle have?

Example 7

hard
Use a symmetry argument to evaluate ∫0π/2sin⁡xsin⁡x+cos⁡x dx.

Example 8

easy
Is f(x)=x2 symmetric about the y-axis?

Example 9

medium
Use the symmetry of sin⁡ (odd function) and cos⁡ (even function) to simplify: sin⁡(−θ)+cos⁡(−θ).

Example 10

medium
Is x2+y2=9 symmetric about the x-axis, y-axis, both, or neither?

Example 11

challenge
A 3D cube has how many rotational symmetries (including identity)? Reason via faces.

Example 12

medium
How many rotational symmetries (including the identity) does a regular pentagon have?

Example 13

medium
If a+b+c=6 and the expression a2+b2+c2 is symmetric, what is its minimum value over real a,b,c with the given sum?

Example 14

medium
The polynomial expression a2+b2+c2−ab−bc−ca is symmetric in a,b,c. If a=b=c, what is its value?

Example 15

challenge
Suppose f satisfies both f(x)=f(−x) (even) and f(x)=−f(−x) (odd) for all x. What must f be?

Example 16

easy
Determine whether f(x)=x3 is odd, even, or neither, by testing the symmetry condition.

Example 17

easy
Is f(x)=x4−3x2+1 even, odd, or neither?

Example 18

hard
Find all real solutions of x4−5x2+4=0 by exploiting its symmetry in x→−x.

Example 19

easy
Is the expression a+b symmetric in a and b?

Example 20

medium
Use symmetry to show the graph of y=1x is symmetric about the origin.