1.
AB=2 cm
BD=7 cm
CD=4 cm
CE=9 cm
DE=CE-CD=9-4=5 cm
AE=AB+BD+DE=2+7+5=14 cm
Raspuns: d) 14 cm
2.
180-55=125°
2x+35=125
2x=90
x=45°
Raspuns: c)45°
3.
ΔABC isoscel
AB=AC
∡B=75°=∡C⇒ A=180-150=30°
AB=4 cm=AC
A=?
[tex]A_{ABC}=\frac{AB\cdot AC\cdot sin A}{2} =\frac{4\cdot 4\cdot sin30}{2} =\frac{16\cdot \frac{1}{2} }{2} =4\ cm^2[/tex]
Raspuns: a) 4 cm²
Un alt exercitiu de geometrie gasesti aici: https://brainly.ro/tema/8708332
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