In Fig. 2.16, (a) ∠ AOD is a/an _____ angle (b) ∠ COA is a/an _____ angle (c) ∠ AOE is a/an _____ angle

Question

Philoid · Accepted Answer

(a) Right

(b) acute

(c) obtuse

∠AOD = 90 (40+20+30)

∠COA = 50 (20+30) (less than 90, which makes it acute)

∠AOE = 130 (40+40+20+30) (between 90 and 180 which makes it obtuse.)