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Mathematics 20 Online
OpenStudy (anonymous):

Jeff determines that triangle CGD is an isosceles triangle. Which statement best describes Jeff’s conclusion? It is incorrect because angle GCD = 54°, angle GDC = 36°, and angle CGD = 90°. It is correct because angle GCD = 54°, angle GDC = 63°, and angle CGD = 63°. It is correct because angle GCD = 36°, angle GDC = 72°, and angle CGD = 72°. It is incorrect because angle GCD = 36°, angle GDC = 81°, and angle CGD = 63°.

OpenStudy (anonymous):

OpenStudy (anonymous):

i am pretty lost on this problem i need help. . . can someone help me please?

OpenStudy (anonymous):

i dont understand how the numbers of degrees is in the same triangle in each choice

ganeshie8 (ganeshie8):

you familiar with- vertically opposite angles ? can you tell what angle G is ?

OpenStudy (anonymous):

no i am not...

OpenStudy (anonymous):

oh thats makes it a lil bit easier

OpenStudy (anonymous):

knocked out 2 of the options now a 50/50

ganeshie8 (ganeshie8):

which two you think ?

OpenStudy (anonymous):

B and C

ganeshie8 (ganeshie8):

yeah thats right!

OpenStudy (anonymous):

so its B sweet B-)

OpenStudy (anonymous):

cuz what gives it away is the 63 degree right?

ganeshie8 (ganeshie8):

|dw:1343366827481:dw|

OpenStudy (anonymous):

that is vertcally opposite

OpenStudy (anonymous):

right?

ganeshie8 (ganeshie8):

correct ! so it equals what ?

ganeshie8 (ganeshie8):

i mean in your pix- angle G equals what ?

OpenStudy (anonymous):

63?

ganeshie8 (ganeshie8):

thats right!!

OpenStudy (anonymous):

yay!!!!! B-)

ganeshie8 (ganeshie8):

you can find C, the same way using triangle ABC

OpenStudy (anonymous):

yeah i can see that. . . i call that a bonus lol

ganeshie8 (ganeshie8):

once you have C, you have D as well... then its easy to figure out :)

OpenStudy (anonymous):

sweet B-) thanks for your help i deeply appreciate it B-)

ganeshie8 (ganeshie8):

np... yw:D

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