AC Geometry 9th Midterm Review (Ch. 3, 4, and 5)

Front

What is the definition of a triangle?

Back

A triangle is a polygon with three edges and three vertices.

Front

What are the types of triangles based on side lengths?

Back

1. Equilateral: all sides are equal. 2. Isosceles: two sides are equal. 3. Scalene: all sides are different.

Front

What is the Pythagorean theorem?

Back

In a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides (a² + b² = c²).

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

What is a parallel line?

Back

Parallel lines are lines in a plane that do not meet; they are always the same distance apart.

Front

What is the definition of a transversal?

Back

A transversal is a line that crosses at least two other lines.

Front

What are corresponding angles?

Back

Corresponding angles are pairs of angles that are in similar positions at each intersection where a transversal crosses two lines.

Front

What is the definition of congruent figures?

Back

Congruent figures are figures that have the same shape and size.

Front

What is the definition of a polygon?

Back

A polygon is a closed figure formed by a finite number of straight line segments.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.