Apply Rectangle Area and Perimeter Formulas
4th Grade Math · Flashcards
4TH GRADE MATH · FLASHCARDS
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QUESTION
Find the width when a rectangle has area
A
=
42
A = 42
A
=
42
and length
l
=
7
l = 7
l
=
7
.
QUESTION
Find the missing side
l
l
l
if
P
=
44
P = 44
P
=
44
yd and
w
=
9
w = 9
w
=
9
yd.
QUESTION
Find the missing length
l
l
l
if
P
=
44
P = 44
P
=
44
and
w
=
8
w = 8
w
=
8
for a rectangle.
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ANSWER
l
=
14
l = 14
l
=
14
. Use
P
=
2
l
+
2
w
P = 2l + 2w
P
=
2
l
+
2
w
:
44
=
2
l
+
2
(
8
)
44 = 2l + 2(8)
44
=
2
l
+
2
(
8
)
, so
l
=
14
l = 14
l
=
14
.
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