Download algebra-interior-angles-1-done

Name :
Sheet 1
Triangle - Interior Angles
A) Solve for x in each triangle and find the measure of the indicated interior angle.
1)
2)
3)
F
C
(9x + 19)0
B
(–2x)0
(–5 – 8x)0
K
350
(–19 + 3x)0
390
(x + 28)0
(6x)0
D
A
L
560
J
E
x=
x=
x=
mÐC =
mÐF =
mÐJ =
4)
5)
6)
U
R
X
x)0
870
(7x + 4)0
T
V
(10
–2
(3x + 1)0
(8x – 4)0
)0
540
P
+
(–3
(–9x – 5)0
Q
2x
600
W
S
x=
x=
x=
mÐQ =
mÐS =
mÐV =
B) Solve for x in each triangle and find the measure of the indicated interior angles.
V
(3x)0
(–5
7
Z
(3
(–4x – 2)0
x–
35
)0
X
(–5x – 9)0
(x –
3)0
(–1 – 7x)0
(–49 + 6x)0
(2x)0
B
Y
C
T
x=
x=
x=
mÐB =
mÐX =
mÐT =
mÐC =
mÐY =
mÐU =
mÐD =
mÐZ =
mÐV =
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x)0
9)
D
+4
8)
7)
U
Name :
Answer key
Sheet 1
Triangle - Interior Angles
A) Solve for x in each triangle and find the measure of the indicated interior angle.
1)
2)
3)
F
C
(9x + 19)0
B
(–2x)0
(–5 – 8x)0
K
350
(–19 + 3x)0
390
(x + 28)0
(6x)0
D
A
L
560
J
E
x=
–15
x=
mÐC =
1150
mÐF =
4)
5)
7
820
mÐJ =
610
X
870
x)0
33
6)
U
R
x=
(7x + 4)0
T
V
(10
–2
(3x + 1)0
(8x – 4)0
)0
540
P
+
(–3
(–9x – 5)0
Q
2x
600
W
S
x=
–11
x=
19
x=
mÐQ =
940
mÐS =
350
mÐV =
8
600
B) Solve for x in each triangle and find the measure of the indicated interior angles.
V
(3x)0
(–5
7
Z
(3
(–4x – 2)0
x–
35
)0
X
(–5x – 9)0
(x –
3)0
(–1 – 7x)0
(–49 + 6x)0
(2x)0
B
x)0
9)
D
+4
8)
7)
Y
C
T
x=
24
x=
–12
x=
30
mÐB =
950
mÐX =
510
mÐT =
270
mÐC =
480
mÐY =
830
mÐU =
630
mÐD =
370
mÐZ =
460
mÐV =
900
Printable Worksheets @ www.mathworksheets4kids.com
U