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Mathematics 13 Online
OpenStudy (samirahdanyel):

Angle D is a circumscribed angle of circle O. What is the perimeter of kite OBDE? 17 units 23 units 27 units 40 units

OpenStudy (samirahdanyel):

jimthompson5910 (jim_thompson5910):

are you able to find the length of segment AB?

OpenStudy (samirahdanyel):

no

jimthompson5910 (jim_thompson5910):

use the pythagorean theorem a^2+b^2 = c^2 a = 8 b = 15 c = unknown

jimthompson5910 (jim_thompson5910):

8^2 + 15^2 = c^2 c = ???

OpenStudy (samirahdanyel):

i got 17

jimthompson5910 (jim_thompson5910):

yep

jimthompson5910 (jim_thompson5910):

AB = 17 which is the diameter radius OB is half of that, so 17/2 = 8.5

jimthompson5910 (jim_thompson5910):

OB = 8.5 OE = 8.5 since they're both radii of the same circle

jimthompson5910 (jim_thompson5910):

also, BD = ED because of the properties of the kite and it's symmetry

OpenStudy (samirahdanyel):

so you add both of those?

jimthompson5910 (jim_thompson5910):

OB = 8.5 OE = 8.5 BD = 5 ED = 5

jimthompson5910 (jim_thompson5910):

Add up the four sides

OpenStudy (samirahdanyel):

i got 27

jimthompson5910 (jim_thompson5910):

which is the correct answer

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