Question

EX 2,4,6 Repede DAU COROANA PLUS 100 de puncte URGENTTTTTT!!!!!!!! Aveti poza atașata

Answer 1

Răspuns:

Explicație pas cu pas:

2)

AB²=BC*BD

8²=BC*2

BC= 64/2

BC=32 cm ( ipotenuza)

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3)

sin 30°=1/2

cos30°=1/2

sin 30+cos 30 = 1/2+1/2 =1

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3)

AB=AC= 4

BC²=4²+4²

BC²=16+16

BC²=32

BC=√32

BC= 4√2

Answer 2

Răspuns:

2.

∆ ABC dreptunghic

AB =8cm

AD perpendicular pe BC

BD =2cm

BC=?

∆ ABC dreptunghic. |

AD perpendicular pe BC | => AB = √BD•BC

=> BC = AB •AB / BD

= 8•8/2

= 64/2

BC = 32 cm

4.

sin 30° +cos 60°= 1/2 +1/2

= 2/2

=1

6.

∆ ABC dreptunghic isoscel

AB=AC=4cm

BC=?

=> T.P => AB•AB +AC•AC=BC•BC

=> 4•4+4•4= BC•BC

=>32=BC•BC

=> BC = √32

=> BC = 4√2 cm