8th Grade
Angles in Triangles
CCSS 8.G.A.5
NOT TO
SCALE
Find the missing angles.
Section A
1)
2)
100°
3)
50°
a°
45°
60°
b°
30°
a=
b=
4)
c=
5)
34°
6)
d=
f=
e=
e°
26°
d°
f°
Section B
1)
93°
b°
2)
a°
c°
3)
49°
116°
41°
c°
a=
c=
b=
4)
5)
d°
62°
6)
56°
10°
40°
e°
53°
38°
d=
138°
f°
e=
147°
f=
Extension
The diagram shows a regular pentagon.
x°
Find the missing angle x.
72°
© Visual Maths Resources Ltd
www.cazoommaths.com
Geometry . 8th Grade . Lines & Angles . Angles in Triangles