This math topic focuses on the skill of determining the equation necessary to calculate a missing angle in a triangle. It involves recognizing the sum of angles in different types of triangles (such as the standard sum of 180 degrees for a flat triangle). Each problem presents a scenario with two known angle measurements, and learners must choose the equation that correctly computes the missing angle from multiple choices.
Work on practice problems directly here, or download the printable pdf worksheet to practice offline.
Practice:
Equation to Find the Missing Angle on the Triangle
Complete these online problems with 80% or 4 correct answers in a row. Results are immediate.
Find the equation that will help you calculate the missing angle of the triangle
Equation to Find the Missing Angle on the Triangle Worksheet
| Math worksheet on 'Equation to Find the Missing Angle on the Triangle (Level 3)'. Part of a broader unit on 'Geometry - Angles and Transformations - Intro' Learn online: app.mobius.academy/math/units/geometry_angles_and_transformations/ |
1
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 35 + 57 + ? = 360 |
b
| 35 + 57 + ? = 90 |
c
| 35 - 57 - ? = 360 |
d
| 2(35 + 57 + ?) = 180 |
e
| 35 + 57 + ? = 180 |
2
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 68 + 75 + ? = 90 |
b
| 68 + 75 + ? = 360 |
c
| 68 + 75 + ? = 180 |
d
| 2(68 + 75 + ?) = 180 |
e
| 68 - 75 - ? = 360 |
3
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 2(55 + 45 + ?) = 180 |
b
| 55 + 45 + ? = 90 |
c
| 55 + 45 + ? = 360 |
d
| 55 - 45 - ? = 360 |
e
| 55 + 45 + ? = 180 |
4
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 70 - 48 - ? = 360 |
b
| 70 + 48 + ? = 180 |
c
| 2(70 + 48 + ?) = 180 |
d
| 70 + 48 + ? = 90 |
e
| 70 + 48 + ? = 360 |
5
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 63 - 32 - ? = 360 |
b
| 2(63 + 32 + ?) = 180 |
c
| 63 + 32 + ? = 180 |
d
| 63 + 32 + ? = 360 |
e
| 63 + 32 + ? = 90 |
6
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 63 - 37 - ? = 360 |
b
| 63 + 37 + ? = 180 |
c
| 63 + 37 + ? = 360 |
d
| 2(63 + 37 + ?) = 180 |
e
| 63 + 37 + ? = 90 |
7
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 75 - 68 - ? = 360 |
b
| 75 + 68 + ? = 360 |
c
| 75 + 68 + ? = 90 |
d
| 2(75 + 68 + ?) = 180 |
e
| 75 + 68 + ? = 180 |