Page 75 - E booklet prep 2_Neat

Remarks:

1- Both of the base angles in the isosceles triangle are
acute.

2- The vertex angle in the isosceles triangle can be acute ,
right or obtuse.

3- The measure of any exterior angle of a triangle is equal

to the sum of measure of the two non-adjacent interior
angles

Theorem2:

? If two angles of a triangle are congruent, then two
opposite sides to these two angles are congruent and
the triangle is isosceles.

Corollary:

? If the angles of a triangle are congruent, then the
triangle is equilateral.

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1ST TERM MATH-PREP.2