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 23 Page 420

∠ RST is the angle created by the two rays SR and ST.

42^(∘)

Practice makes perfect

The equation m∠ RST=114^(∘) tells us that the angle between the two rays, SR and ST, is 114^(∘). Similarly, ∠ RSV is the angle between rays SR and ST. Let's mark these three angles in two different figures.

From the figures, we can see that the sum of ∠ RSV and 72^(∘) is 114^(∘). ∠ RSV+72^(∘)=114^(∘) Let's solve the equation to find ∠ RSV.

∠ RSV+72^(∘)=114^(∘)

LHS-72^(∘)=RHS-72^(∘)

∠ RSV=42^(∘)

Subchapter links

Communicate Your Answer p.413

Monitoring Progress p.414-418

Exercises p.419-422