Question

Cine ma poate ajuta si pe mine?

Answer 1

Răspuns:

Explicație pas cu pas:

4.

AB = 6

BC = 8

<B = 60°

sin 60° = √3/2

A = AB*BC*sinB/2 = (6*8*√3/2)/2 = 12√3

5.

AB = 4

AC = 5

<A = 30°

sin 30° = 1/2

A = AB*AC sinA/2 = (4*5*1/2)/2 = 5

Answer 2

$\bf 4.\\ \\ \it \mathcal{A}=\dfrac{AB\cdot BC\cdot sinB}{2}=\dfrac{6\cdot8\cdot sin60^o}{2}=24\cdot\dfrac{\sqrt3}{2}=12\sqrt3\ cm^2\\ \\ \\ \bf 5.\\ \\ \it \mathcal{A}=\dfrac{AB\cdot AC\cdot sinA}{2}=\dfrac{4\cdot5\cdot sin30^o}{2}=10\cdot\dfrac{1}{2}= 5\ cm^2$