Mathematical Concepts and Expressions

What does it mean for segments to be congruent?

• They have the same length.

• They intersect at a right angle.

Answer explanation

Segments are congruent when they have the same length. This means that if you measure both segments, they will be equal in size, which is the defining characteristic of congruence.

The notation for similar triangles is:

• ~

• ||

Answer explanation

The notation for similar triangles is represented by the symbol '~'. This symbol indicates that two triangles have the same shape but may differ in size, distinguishing it from other symbols like '==' or '≠'.

What is the quadratic formula?

• x = (b ± √(b²-4ac)) / 2a

• x = (-b ± √(b²-4ac)) / 2a

The formula for the vector is given by (a)  

What is the formula for standard deviation?

• The square root of the variance

• The difference between the maximum and minimum values

Answer explanation

The standard deviation is defined as the square root of the variance, which measures the dispersion of data points from the mean. This makes 'The square root of the variance' the correct choice.