MATH 2 UNIT 1 REVIEW

How to determine a figure’s rotation symmetry?

Find the line of symmetry, and divide 360°/how many lines are possible.

how many rotation symmetry does a pentagon have?

A regular pentagon has 5 points of rotational symmetry, as it can be rotated by multiples of 72° (360°/5)

How to reflect over x or y line?

Calculate the distance from each point to the give line, and move that distance in the opposite direction.

Which is an definition of how to reflect over an x or y line?

(-2,1) , y=-2 , is 3 units away, so = (-2,-2) = Now move those 3 units in the opposite direction=(-2,-5)

Figures with 180° rotation symmetry must have all congruent sides

False

All triangles have rotation symmetry

False

Figures with no reflection symmetry can still have rotation symmetry

True

All rectangles have 180° rotation symmetry

True

If two angles are linear pair they are:

Supplementary to each other

Supplementary angles add up to 180°

True

All triangles have interior angles that sum to 180°

True

Vertical angles are:

Congruent to each other

Explain why a+b=d

A+b+c=180° by the Triangle Sum theorem

Explain why a+b=d

A+b+c=c+d so by solving this as a normak equation, -c from both sides and you get a+b=d

Explain why a+b=d

C+d=180° because they form a linear pair.