Răspuns :

Salut! :)
Baza = BC => < B = < C = x
( < A + < B )/2 = 65°
< A + < B = 65° × 2 = 130° => < A = 130° - x
< A + < B + < C = 180°
130° - x + x + x = 180°
130° + x = 180°
x = 180° - 130° = 50° => < B = < C = 50°
< A = 130° - 50° = 80°

Dianageorgiana794id

Răspuns:

ΔABC isoscel,  [AB]≡[AC]=>∡B≡∡C

Ma=(a+b)/2

(∡a+∡B)/2=65°

∡A+∡B=65·2=>∡A+∡B=130°

∡A+∡B+∡C=180°

130°+∡C=180°=>∡C=180°-130°=>∡C=50°

∡C=∡B=50°

∡A+50°+50°=180°=>∡A=180°-100°=>∡A=80°

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