- Angles, Lines, and Polygons
- Home
- Measuring an angle with the protractor
- Acute, obtuse, and right angles
- Naming segments, rays, and lines
- Identifying parallel and perpendicular lines
- Acute, obtuse, and right triangles
- Classifying scalene, isosceles, and equilateral triangles by side lengths or angles
- Finding an angle measure of a triangle given two angles
- Naming polygons
- Drawing and identifying a polygon in the coordinate plane

- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who

# Finding an angle measure of a triangle given two angles

The sum of angles of a triangle is 180°.

In a triangle, we know there are three angles and three sides. In this lesson we solve for missing angle measure given two angle measures in a triangle.

Find the missing angle in the given triangle below. Sum of angles in a triangle is 180°.

### Solution

**Step 1:**

Sum of angles in a triangle is 180°.

29° + 33° + b = 180°; 62° + b = 180°

**Step 2:**

b = 180° − 62° = 118°

So missing angle = 118°

Find the missing angle in the given triangle below. Sum of angles in a triangle is 180°.

### Solution

**Step 1:**

Sum of angles in a triangle is 180°.

29° + 33° + b = 180°; 62° + b = 180°

**Step 2:**

b = 180° − 62° = 118°

So missing angle = 118°

Advertisements