Question

plz solve ques 16..plz​

Answer 1

a.□ABCD is a parallelogram prove it :. /_A=/_D due to interior angle theorem

b.In parallelogram opposite sides are parallel

Answer 2

Answer:

Step-by-step explanation:

given:  parallelogram abcd,ab=cd,ad=bc

const:  join bd

to prove:  1.angle A= angle B

                2.AB//CD

proof:   1.

            in triangle ABD and triangle BCD

            ab=cd[given]

           ad=bc[given]

            bd=bd[common]

            therefore triangle ABD IS CONGRUENT TO TRIANGLE BCD

            now,

            angle A =angle B [by cpct]

             2.

              angle DBC= angle ADB [by cpct]

              also they form alternate interior angles therefore AB//CD

              HENCE PROVED