Victory for the ACT Exam 16e TG Sample

506 • M ATH

STUDENT TEXT, p. 185 5 . In the �igure below, what is the sum, in degrees, of the indicated angles?

EXPLANATIONS

5. (C) Mathematics/Geometry/Lines and Angles CC: 8.G.A.5 CCRS: AVG+.G.1 Difficulty Level = 2; Teaching Time = 5–8 minutes; Purpose = Example Un us emtbheer foo fr md euglraefeosr itnh ae pt ootlaylg o n : ( ) ( ) n 180 2 180 7 2 180(5) 900 = . Alternatively, divide the �igure into tnrui amnbgeurl aorf rter gi ai on ng lseas nbdy m1 8u0l t:i p l y t h e

Don’t Forget This! Tinhteersiuomr aonfgtlhese of an n -sided polygon is n 180 2 c − ] g . Share! Wd ohyaot us ourstes ionf yuonui trs daily life?

A. B. 5 7 4 2 0 0 C. 900 D. 1,080

There are �ive triangles in the polygon, so tishe total number of degrees in the polygon 5(180) 900 = .