Missing Angle on the Triangle (Level 3)

This math topic focuses on finding missing angles in triangles, specifically within the context of isosceles and equilateral triangles. These problems help students apply the geometric principle that the sum of interior angles in a triangle is always 180 degrees. The questions vary in difficulty and offer multiple answers, challenging students to use their understanding of triangle properties and angle relationships effectively. This set of problems is suitable for practice at an intermediate level in geometry.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.

Missing Angle on the Triangle Worksheet

Math worksheet on 'Missing Angle on the Triangle (Level 3)'. Part of a broader unit on 'Geometry - Isosceles and Equilateral Triangles' Learn online: app.mobius.academy/math/units/geometry_triangles_isosceles_equilateral_intro/

1

Find the missing angle of the triangle

a

80

b

70

c

60

d

90

e

50

f

55

2

Find the missing angle of the triangle given that the interior angles must add up to 180°

a

34

b

64

c

42

d

12

e

19

f

49

3

Find the missing angle of the triangle

a

110

b

90

c

145

d

120

e

115

f

100

4

Find the missing angle of the triangle given that the interior angles must add up to 180°

a

96

b

81

c

118

d

111

e

103

f

126

5

Find the missing angle of the triangle

a

50

b

25

c

55

d

35

e

40

f

65

6

Find the missing angle of the triangle given that the interior angles must add up to 180°

a

20

b

35

c

27

d

57

e

42

f

65

7

Find the missing angle of the triangle given that the interior angles must add up to 180°

a

41

b

56

c

86

d

63

e

48

f

71