Question

Exercitiile 17 18 19

Answer 1

17)AD=lățime

AB=AD×2

AB=6cm×2

AB=12cm12cm

P=AB+CD

P=12cm+6cm

P=18cm

A=2×(AB+AD)

A=2×(12cm+6cm)

A=2×18cm

A=36cm²

AC=6cm(AB-AD)

19)toate laturile rombului sunt concurente

A=

$\frac{ac \times bd}{2} = \frac{6 \times 6}{2} = \frac{36}{2} = 18$