Question

If in a trapezium ABCD, AB is parallel to CD,∠A = ∠D = 90°

,∠C = 120°, DC= 28 cm and BC = 40 cm, then find the lengths of AB and AD. Also find the perimeter of ABCD.​

Answer 1

Answer:

it's easy uh just want to find the measure of ab and ad and after that uh have to 4×the answer you get..

Answer 2

Step-by-step explanation:

In △BCE, by heron's formula we have

a=39cm,b=45cm and c=42cm

⇒s=

2

a+b+c

=

2

39+42+45

=63cm

∴ Area of ΔBEC=

s(s−a)(s−b)(s−c)

=

63(63−39)(63−42)(63−45)

cm

2