Question

the adjacent side of parallogran ABCD ab= 34 BC= 20cm Digional ac= 42cm. find area of parallogran

Answer 1

by formula s=a+b+c/2
s = 34+20+42/2=96/2=48
area of triangle abc =
$\sqrt{s(s - a)(s - b)(s - c)}$
$\sqrt{48(48 - 34)(48 - 20)(48 - 42)}$
$\sqrt{48 \times 14 \times 28 \times 6}$

2×4×6×7=48×7=336
so area of parr = 2× area of triangle
= 2×336 =672