Coordinate Geometry and Triangles

What is the measure of x?

• 12

• 15

• 6

• 9

Triangles Δ ABC and Δ A'B'C' are graphed in the standard (x,y) coordinate plane below. Triangle Δ A'B'C' is the image of Δ ABC under one of the following transformations. Which one?

• Horizontal translation

• Reflection across the x-axis

• Reflection across the y-axis

• Line

• Square

• Pentagon

• Parallelogram

• Scalene Triangle

What is the sum of the interior angles of a triangle in Euclidean Geometry?

• 180

• 200

• 360

• 90

A segment joining the midpoints of two sides of a triangle.

• midsegment

• midpoint

• parallel

• perpendicular