△LMN

is isosceles, with ∠M≅∠L
and m∠L=36°
. What are the measures of angles M
and N

1 answer

In an isosceles triangle, the two angles opposite the equal sides are congruent. Given that \( \triangle LMN \) is isosceles with \( \angle M \cong \angle L \) and \( m\angle L = 36^\circ \), we can conclude:

\[ m\angle M = 36^\circ \]

Since the sum of the angles in any triangle is \( 180^\circ \), we can find the measure of angle \( N \) as follows:

\[ m\angle L + m\angle M + m\angle N = 180^\circ \]

Substituting the known values:

\[ 36^\circ + 36^\circ + m\angle N = 180^\circ \]

\[ 72^\circ + m\angle N = 180^\circ \]

Now, subtract \( 72^\circ \) from both sides:

\[ m\angle N = 180^\circ - 72^\circ = 108^\circ \]

Thus, the measures of the angles in triangle \( LMN \) are:

\[ m\angle M = 36^\circ, \quad m\angle L = 36^\circ, \quad m\angle N = 108^\circ. \]