In two isosceles triangles, theargles at the verter where two equal sides meet are equal. Are the triangles congruent? Give reason(s) for yo if/

Câu 28. Cho tam giác \( A B C \) đều cạnh \( a \), có \( A H \) là đường trung tuyến. Biết rằng \( |\overrightarrow{A C}+\overrightarrow{A H}|=\frac{a v b}{c} \). Tính \( b-c \). \( \mathrm{KQ}: \square \)

Encontrar la distancia entre los puntos dados: \( (1,-2,4) \quad(4,-3,1) \)

Per la seguente relazione definita in \( A \), traccia il grafo che la rappresenta: \[ a \mathcal{R} b \leftrightarrow a+b \text { è un numero pari minore di } 20, A=\{a \in \mathbb{N} \mid 6<a \leq 11\} \]

Which of the following methods would not be used to prove that two triangles are congruent? A. ASA (B) SAS (C) AAS (D) SSA

Sketch each triangle. Then, determine the unknown side and angles. If two solutions are possible, give both. a) In \( \triangle \mathrm{ABC}, \mathrm{AB}=15 \mathrm{~m}, \mathrm{BC}=5 \mathrm{~m} \), and \( \angle \mathrm{A}=20^{\circ} \).