Semester 1 Exam Review

Front

What are non-collinear points?

Back

Non-collinear points are points that do not all lie on the same straight line. For example, points F and B are non-collinear.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

If m∠2 = 60°, what is m∠4 if they are supplementary?

Back

m∠4 = 120° because supplementary angles add up to 180°.

Front

How do you set up an equation for an angle measurement?

Back

To set up an equation for an angle measurement, you can express the relationship between angles using algebra. For example, if m∠ABC = 103°, you can set up the equation 3x + 1 + 4x - 3 = 103.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

What is the definition of complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What is the formula for finding the measure of an angle in a linear pair?

Back

In a linear pair, the two angles are supplementary, so their measures add up to 180°. If one angle is known, the other can be found by subtracting from 180°.

Front

What is the relationship between vertical angles?

Back

Vertical angles are equal; when two lines intersect, the opposite angles formed are congruent.

Front

What is the definition of a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.