Question

Calculati aria paralelogramului ABCD, AC intersectat BD stiind ca :
c) AB=7cm; BC=2radical3; m (<ABC)= 60°

AM NEVOIE URGENTA!!!!!!
DAU COROANA.

Answer 1

$\it \mathcal{A} =AB\cdot BC\cdot \sin B =7\cdot2\sqrt3\cdot\dfrac{\sqrt3}{2} = 7 \cdot3=21\ cm^2$

Aria =AB·BC·sin B =7·2√3·(√3/2) = 21 cm²

sin 60° =√3/2