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Răspuns:

1) 180°-70°=110°

2) (5+3):2=8:2=4

3) P=4*l=4*6=24cm

4)A=l²=7²=49cm²

5) A=(C*C):2=4*5:2=20:2=10cm²

6)90°

7) a) A=B*h:2=8*5:2=20cm²

b)20=AC*BE:2 Unde BE perpendiculara pe AC

20=10*BE:2

10BE=40

BE=40:10=4

8)l=3/4 *12=36/4=9cm

a) P=2*L+2*l=2*12+2*9=24+18=42cm

b) A=L*l=12*9=108cm²

9)a) A=8*6:2=48:2=24cm²

b)

A trABD= BD*AO:2=6*4:2=12

12=5*h:2

24=5*h

h=24/5