Yes an isosceles triangle has an apex angle and 2 equal base angles.
The 3 angles add up to 180 degrees.
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Yes if it is an isosceles triangle.
Not normally because an apex angle is found on an isosceles triangle.
An isosceles triangle has 2 equal base angles and its height is perpendicular from its apex to the centre of its base
None but its apex is perpendicular to its base
Because it's perpencicular to its apex