Lesson 1-2Lesson 1-2

Linear Measure and Linear Measure and PrecisionPrecision

Ohio Content Standards:

Ohio Content Standards:

• Estimate and compute various attributes, including length, angle measure, area, surface area and volume, to a specified level of precision.

Ohio Content Standards:

• Use appropriate levels of precision when calculating with measurements.

Vocabulary

Vocabulary

• Line segment:

Vocabulary

• Line segment:

part of a line that can be measured because it has two endpoints

Use a metric ruler to draw each Use a metric ruler to draw each segment.segment.

Use a metric ruler to draw each Use a metric ruler to draw each segment.segment.

• Draw Draw LMLM that is 42 millimeters that is 42 millimeters long.long.

Use a metric ruler to draw each Use a metric ruler to draw each segment.segment.

• Draw Draw LMLM that is 42 millimeters that is 42 millimeters long.long.

• Draw Draw QR QR that is 5 centimeters long.that is 5 centimeters long.

Use a customary ruler to draw Use a customary ruler to draw each segment.each segment.

Use a customary ruler to draw Use a customary ruler to draw each segment.each segment.

• Draw Draw DEDE that is 3 inches that is 3 inches long.long.

Use a customary ruler to draw Use a customary ruler to draw each segment.each segment.

• Draw Draw DEDE that is 3 inches that is 3 inches long.long.

• Draw Draw FQFQ that is 2 ¾ inches that is 2 ¾ inches long.long.

Vocabulary

Vocabulary

• Precision-

Vocabulary

• Precision-

smallest unit available on the measuring tool

Vocabulary

• Precision-

smallest unit available on the measuring tool

*The measurement should be within 0.5 unit of measure.

Find the precision for each Find the precision for each measurement. Explain its measurement. Explain its

meaning.meaning.

Find the precision for each Find the precision for each measurement. Explain its measurement. Explain its

meaning.meaning.

• 32 ¾ inches32 ¾ inches

Find the precision for each Find the precision for each measurement. Explain its measurement. Explain its

meaning.meaning.

• 32 ¾ inches32 ¾ inches

• 15 millimeters15 millimeters

Vocabulary

Vocabulary

• Betweenness of points -

Vocabulary

• Betweenness of points –

for any two points on a number line, there will be a least one point that lies in between them

Vocabulary

• Between -

Vocabulary

• Between-

to be in the middle of something

2.6 cm

4 cm

NM

L

Find LM.

2.6 cm

4 cm

NM

L

5 5/8 in. ZYX 2 ½ in.

Find XZ.

5 5/8 in. ZYX 2 ½ in.

5x - 3 STU 7x

Find x and ST if T is between S and U, ST = 7x, SU = 45, and TU = 5x – 3.

5x - 3 STU 7x

Vocabulary

Vocabulary

• Congruent-

Vocabulary

• Congruent-

having the same measure

Vocabulary

• Constructions-

Vocabulary

• Constructions-

methods of creating geometric figures without the benefit of measuring tools

The Arial font is often used because it is easy to read. Study the word TIME shown in Arial type. Each letter can be broken into individual segments. The letter T would have two segments, a short horizontal segment, and a long vertical segment. Assume that all segments overlap when they meet. Which segments are congruent?

Assignment:

Pgs. 17 - 19

12-19 all, 22-36 evens, 58-64

all