Question

abcd is a parallellogram with angle A =(4x+15) and angle C =(5x+4) find A

Answer 1

ABCD is a parallelogram
so, opp. angles will be equal
Angle A = angle C
4x+15 = 5x +x
x = 11
angle A = 4x+ 15
= 4(11) + 15
44 + 15
59

Answer 2

We know that opposite angles of a parallelogram are congruent.i.e.,<A=<C
4x+15=5x+4
4x-5x=4-15
-x=-11
x=11

Now <A=4x+15
=4*11+15
=44+15
=59 answer