Page 77 - Math Course 1 (Book 2)

Measurements in Geometry

Length in Customary Units
MO. 9 - L2b
Find the Length AZ
A Z Computing with Measures

Vocabulary A-Z

Let us learn some vocabulary
A. 6 in.

1
B. 1 in.
4
betweenness of points
C. 2 in. in any two real numbers a and b, there is a real
number n between a and b such that a < n < b.
1
D. 1 in. Answer 3y + 1
2
QR = QP + PR
2y 21 Betweenness of
Find the length of IX . points.
I X Q P R

Between

a point is between another 2 points if, and only if,
the 3 points are collinear and AB + BC = AC
1
A. 2 in.
2
B. 2 in.

1
C. 2 in. A B C
4
3
D. 2 in. Answer congruent
4 When segments have the same measure, they are
said to be congruent.
Length in Customary Units
3.3 cm
AB and BC are congruent
A. PRECISION Find the precision for 88 millimeters. 3.3 cm A
(they have the same B
A. 0.25 mm measure). C
B. 0.5 mm
C. 1 mm Answer absolute error
D. 2 mm
The absolute value of the difference between the
5 exact measure/value of an object and the
B. PRECISION Find the precision for 7 inches.
8 allowable measurement.
1
A. in.
16 E = | p – p* | E = | 10.5 – 10.501 |
abs
abs
1
B. in. Exact Value: E = .001m
8 abs
1 p = 10.5m
C. in. E = 1mm
2 abs
Measurement:
D. 1 in. Answer p* = 10.501m

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