This math topic focuses on solving for the missing angles in isosceles and equilateral triangles. Each question presents a triangle with two known angles. Students are tasked with forming equations using the sum of angles in a triangle, which should total 180 degrees, to find the unknown angle. Various answer options include correct and incorrect equations to test students' understanding of angle sum properties and basic algebraic skills.
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 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 equation that will help you calculate the missing angle of the triangle |
a
| 30 - 70 - ? = 360 |
b
| 30 + 70 + ? = 180 |
c
| 2(30 + 70 + ?) = 180 |
d
| 30 + 70 + ? = 90 |
e
| 30 + 70 + ? = 360 |
2
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 30 - 35 - ? = 360 |
b
| 30 + 35 + ? = 90 |
c
| 30 + 35 + ? = 180 |
d
| 2(30 + 35 + ?) = 180 |
e
| 30 + 35 + ? = 360 |
3
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 75 + 60 + ? = 180 |
b
| 75 + 60 + ? = 360 |
c
| 75 - 60 - ? = 360 |
d
| 2(75 + 60 + ?) = 180 |
e
| 75 + 60 + ? = 90 |
4
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 50 + 35 + ? = 90 |
b
| 50 + 35 + ? = 180 |
c
| 2(50 + 35 + ?) = 180 |
d
| 50 - 35 - ? = 360 |
e
| 50 + 35 + ? = 360 |
5
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 30 + 80 + ? = 90 |
b
| 30 - 80 - ? = 360 |
c
| 30 + 80 + ? = 180 |
d
| 2(30 + 80 + ?) = 180 |
e
| 30 + 80 + ? = 360 |
6
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 55 + 45 + ? = 360 |
b
| 55 + 45 + ? = 90 |
c
| 2(55 + 45 + ?) = 180 |
d
| 55 + 45 + ? = 180 |
e
| 55 - 45 - ? = 360 |
7
| Find the equation that will help you calculate the missing angle of the triangle |
a
| 45 - 35 - ? = 360 |
b
| 45 + 35 + ? = 90 |
c
| 45 + 35 + ? = 360 |
d
| 2(45 + 35 + ?) = 180 |
e
| 45 + 35 + ? = 180 |