Տեսական մասը կրկնել այստեղ․
Առաջադրանքներ․
20,24,26
Վարժ․ 20
Տրված է՝
AB=CD
AB//CD
LCBD=15°
—————
LBDA=?
Լուծում
LCBD=LAB=>LBDA=16°
Պատ․՝ 16°
Վարժ․24
Պատ․՝ 78սմ
Վարժ․ 26
Տրված է՝
ABCD
LA+LC=142°
——————
LA;LB;LC;LD=?
Լուծում
LA=LC նշ․ x
X+X=142°
2X=142°
X=142/2=71
LA=LC=71°
LB=LD=180°-71°=109°
Պատ․՝ 71°; 71; 109°; 109°
What did they invent /to retell the text
Write about a famous invention that you think is useful
By January 1879, at his laboratory in Menlo Park, New Jersey, Edison had built his first high resistance, incandescent electric light. It worked by passing electricity through a thin platinum filament in the glass vacuum bulb, which delayed the filament from melting. Still, the lamp only burned for a few short hours.
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