8th Grade Math STAAR Strategies and Tips

What happens to a point's coordinates after a reflection over the x-axis?

• (x, y) goes to (x, -y)

• (x, y) goes to (-x, y)

• (x, y) goes to (-x, -y)

• (x, y) goes to (y, x)

After a 90-degree rotation, how are the coordinates of a point transformed?

• (x, y) goes to (y, -x)

• (x, y) goes to (-y, x)

• (x, y) goes to (x, -y)

• (x, y) goes to (-x, y)

What is the rule for dilation when the scale factor is less than 1?

• The figure enlarges.

• The figure's congruence is preserved.

• The figure reduces in size.

• The figure's orientation changes.

What does a translation to the right and up indicate about the coordinates?

• (x, y) goes to (x - a, y + b)

• (x, y) goes to (x + a, y - b)

• (x, y) goes to (x - a, y - b)

• (x, y) goes to (x + a, y + b)

In the triangle sum theory, what is the sum of the angles in a triangle?

• 270 degrees

• 180 degrees

• 90 degrees

• 360 degrees

How does the exterior angle theory determine the measure of an exterior angle?

• It is equal to the difference of the two opposite interior angles.

• It is half the sum of the two opposite interior angles.

• It is equal to the sum of the two opposite interior angles.

• It is double the sum of the two opposite interior angles.

What pattern does a positive linear association in a scatter plot show?

• Points clustered in one area

• Points scattered randomly

• Points forming a downward trend

• Points forming an upward trend

What does the Pythagorean theorem equation look like?

• a^2 + b^2 = 2c

• 2a + 2b = c^2

• a^2 - b^2 = c^2

• a^2 + b^2 = c^2

What is the formula for the lateral surface area of a prism?

• S = 2(l + w + h)

• S = ph

• S = 2bh

• S = ph + 2b

How do you find the total surface area of a prism?

• S = ph + 2b

• S = ph

• S = 2bh

• S = 2(l + w + h)