This math topic focuses on finding missing angles in triangles, specifically within the context of geometry related to isosceles and equilateral triangles. The problems require students to use the principle that the sum of the interior angles in a triangle is 180 degrees to solve for unknown angles. Each question presents a different triangle graphic, and students must calculate the missing angle. This exercise helps in improving understanding of triangle properties and angle relationships.
Work on practice problems directly here, or download the printable pdf worksheet to practice offline.
Practice:
Missing Angle on the Triangle
Complete these online problems with 80% or 4 correct answers in a row. Results are immediate.
Find the missing angle of the triangle
Missing Angle on the Triangle Worksheet
| Math worksheet on 'Missing Angle on the Triangle (Level 2)'. 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 given that the interior angles must add up to 180° |
a
| 100 |
b
| 90 |
c
| 115 |
d
| 80 |
e
| 70 |
f
| 85 |
2
| Find the missing angle of the triangle given that the interior angles must add up to 180° |
a
| 45 |
b
| 90 |
c
| 75 |
d
| 60 |
e
| 30 |
f
| 50 |
3
| Find the missing angle of the triangle |
a
| 80 |
b
| 90 |
c
| 40 |
d
| 70 |
e
| 60 |
f
| 50 |
4
| Find the missing angle of the triangle given that the interior angles must add up to 180° |
a
| 110 |
b
| 60 |
c
| 120 |
d
| 75 |
e
| 90 |
f
| 105 |
5
| Find the missing angle of the triangle |
a
| 60 |
b
| 30 |
c
| 50 |
d
| 0 |
e
| 20 |
f
| 40 |
6
| Find the missing angle of the triangle given that the interior angles must add up to 180° |
a
| 90 |
b
| 70 |
c
| 55 |
d
| 115 |
e
| 100 |
f
| 85 |
7
| Find the missing angle of the triangle |
a
| 30 |
b
| 60 |
c
| 50 |
d
| 90 |
e
| 80 |
f
| 70 |