Question

quadrilateral ABCD is a paralleogram in which angle B=100 degress. angle A+ angle C=___ degress.

Answer 1

Opposite angles are congruent -> A=C, B=D, A+B+C+D=360.

Answer 2

yeah i know that but i dont know what angle A and angle C is though

Answer 3

You solve for them using the equation I gave you.

Answer 4

but there is only one measurement so i need alittle more help then that

Answer 5

so how do you think if A=C and B=D but you know that B=D=100 degree so B+D=200
- and you know that A+B+C+D=360
so than A+C=360-200=160 so than A=C=160/2 =80

ok ?

Answer 6

Do you know well the properties of parallelograms?
And more importantly, do you know any basic algebra?

Answer 7

okay