body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

Big Ideas Math Integrated I, 2016

BI

Big Ideas Math Integrated I, 2016 View details

5. Measuring and Constructing Angles

Continue to next subchapter

Exercise 2 Page 419

Which angle is described by each statement?

∠ BCA
Explanation: See solution.

Practice makes perfect

From the four options we can immediately see that ∠ 1 refers to the angle at vertex A. The other options name an angle using the triangles three vertices. When using this notation, it's the letter in the middle that points out the angle. Now we can identify all of the angles.

&∠ 1 &&→ angle at vertex A &∠ B CA &&→ angle at vertex C &∠ B AC &&→ angle at vertex A &∠ C AB &&→ angle at vertex A Of the four options, three of them refer to the angle at vertex A and one refers the angle at vertex C.

Therefore, ∠ BCA does not belong.

Subchapter links

Communicate Your Answer p.413

Monitoring Progress p.414-418

Exercises p.419-422