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 19 Page 420

Congruent angles have the same number of arcs.

m∠ BDC=34^(∘)

Practice makes perfect

The notation m∠ BDC refers to the measure of the angle in △ BDC at vertex D.

Recall that congruent angles have the same number of arcs. We see in the diagram that ∠BDC is congruent to ∠ AED, whose measure is 34^(∘). If two angles are congruent, then they have the same measure. Therefore, m∠ BDC = 34^(∘).

Subchapter links

Communicate Your Answer p.413

Monitoring Progress p.414-418

Exercises p.419-422