in parallelogram ABCD, angle A contains 60 degree. What is the sum of angle B and angle D?
1. 60 degree
2. 180 degree
3. 240 degree
4. 280 degree
5. 300 degree

Question

anonymous · Answer

In a parallelogram, diagonal's are congruent.

If thats the case, then if a = 60 then  c is also 60 since it is a's diagonal.

Both diagonals added together equal 120. 

Subtract the total of those two diagonals from the total of 360 
 360 - 120 = 240

240 is the sum of both B and D, the two remaining diagonals.

B=120
D= 120

anonymous · Answer

Also, if you wanted extra info,  Divide 240 by the two remaining sides, which are B & D

240/2 = 120

120 is  the angle of the two remaining  diagonals also

anonymous · Answer

how is mine wrong =p 120 +120 +60+60 =360 too >.>

anonymous · Answer

Nooo, if  a is 60 right?? then its diagonal, c, is also 60.

this together is 120

soo 360 -120 is 240 right.

240 is the some of diagonals B and D

Divided its 120....

anonymous · Answer

meh, just nvm lol ima confuse my head when im to sleepy

anonymous · Answer

Or basically the asnwer is 3, which is what both of us got in the end...

anonymous · Answer

exr0sis is correct

anonymous · Answer

My bad silly mistake. exorsis is correct.