If mzA = 87° and mzB = 32°, find mz1. %3D %3D (Put just the number)

Trigonometry (MindTap Course List)
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ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter2: Right Triangle Trigonometry
Section2.4: Applications
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### Geometry Problem on Triangle Angles

**Problem Statement:**

Given:
- Measure of ∠A = 87°
- Measure of ∠B = 32°

Find:
- Measure of ∠1 (Put just the number)

**Diagram Explanation:**

The figure provided is a triangle labeled as follows:
- Vertex \( A \) at the top.
- Vertex \( B \) at the bottom right.
- Vertex \( C \) at the bottom left.

The triangle is denoted ABC with:
- Angle A being at vertex A with a measure of 87°.
- Angle B being at vertex B with a measure of 32°.
- ∠1 is an exterior angle located at vertex C, pointing away from the base of the triangle.

### Solution:

Using the triangle angle sum property:
\[ m∠C = 180° - m∠A - m∠B \]
\[ m∠C = 180° - 87° - 32° \]
\[ m∠C = 180° - 119° \]
\[ m∠C = 61° \]

Since ∠1 is an exterior angle, it is equal to the sum of the interior opposite angles:
\[ m∠1 = m∠A + m∠B \]
\[ m∠1 = 87° + 32° \]
\[ m∠1 = 119° \]

Therefore:
\[ m∠1 = \boxed{119} \]
Transcribed Image Text:### Geometry Problem on Triangle Angles **Problem Statement:** Given: - Measure of ∠A = 87° - Measure of ∠B = 32° Find: - Measure of ∠1 (Put just the number) **Diagram Explanation:** The figure provided is a triangle labeled as follows: - Vertex \( A \) at the top. - Vertex \( B \) at the bottom right. - Vertex \( C \) at the bottom left. The triangle is denoted ABC with: - Angle A being at vertex A with a measure of 87°. - Angle B being at vertex B with a measure of 32°. - ∠1 is an exterior angle located at vertex C, pointing away from the base of the triangle. ### Solution: Using the triangle angle sum property: \[ m∠C = 180° - m∠A - m∠B \] \[ m∠C = 180° - 87° - 32° \] \[ m∠C = 180° - 119° \] \[ m∠C = 61° \] Since ∠1 is an exterior angle, it is equal to the sum of the interior opposite angles: \[ m∠1 = m∠A + m∠B \] \[ m∠1 = 87° + 32° \] \[ m∠1 = 119° \] Therefore: \[ m∠1 = \boxed{119} \]
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