Calculating Lengths with the Ruler Postulate

The video tutorial explains the ruler postulate, a simple method for measuring lengths. It demonstrates how to measure lengths by subtracting the leftmost index from the rightmost index. The tutorial includes examples of length calculations and discusses congruency in segments. It concludes with tips for using the ruler postulate effectively.

What is the ruler postulate primarily used for?

• Measuring angles

• Finding area

• Calculating lengths

• Determining volume

Why might you need to make adjustments when measuring with a ruler?

• Rulers are often inaccurate

• Edges may not align perfectly

• Blocks are always the same size

• Measurements are always in whole numbers

If a segment starts at 3 and ends at 7, what is its length?

• 6

• 3

• 5

• 4

How do you calculate the length of a segment using the ruler postulate?

• Add the two endpoints

• Multiply the two endpoints

• Subtract the left endpoint from the right endpoint

• Divide the right endpoint by the left endpoint

What is the length of segment AD if it starts at -7 and ends at 7?

• 14

• 15

• 7

• 0

If a scale is different, such as increasing by 5, how should you count?

• By tens

• By fives

• By twos

• By ones

What is the length of segment AC if it starts at -7 and ends at 2?

• 11

• 9

• 7

• 5

What is the length of segment BE if B is at -2 and E is at 9?

• 7

• 9

• 11

• 13

What does it mean for two segments to be congruent?

• They are perpendicular

• They have the same length

• They are parallel

• They intersect

Which segment is congruent to segment AB if AB is 5 units long?

• None of the above

• BD, which is 7 units

• CD, which is 5 units

• CE, which is 7 units