Question

the adajacent sides of a parraleogram abcd are ab=34 bc=20 and diagnol ac =42 find the area of parraleogram​

Answer 1

Answer:

112✓21 sq. units

Step-by-step explanation:

in triangle ABC , using Heron's formula:

a=20

b=34

c=42

s=(a+b+c)/2

=(20+34+42)/2

=48

area of triangle ABC:

✓s(s-a)(s-b)(s-c)

=✓48(48-20)(48-34)(48-42)

=56✓21 sq. units

area of parallelogram ABCD:

2*area of triangle ABC= 2*56✓21

112✓21 sq. units