1/2 of an obtuse angle is a(n): a. obtuse angle. b. acute angle. c. straight angle. d. right angle.

an obtuse angle is an angle between 90° and 180°, but is not 90° or 180° either, so is an angle that is greater than 90° but less than 180°.

half of 180° is 90°, but an obtuse angle has to be less than 180°, say for example hmmm 179.9999999999999°, now, half of that is 89.99999999999995°, which low and behold, is acute.

the answer is 510

step-by-step explanation:

15 • 13 = 195

15 • 12 = 180

15 • 5 = 75

12 • 5 = 60

195 + 180 = 375

375 + 75 = 450

450 + 60 = 510

based on context clues you gave i'm assuming the answer would be c.