The altitude line is perpendicular to the base and bisects the apex of the isosceles triangle.
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Yes
Any right triangle resting on a leg.
Find this using the Pythagorean theorem (a=(1/2 * 8) b=the altitude c = 6).
Yes if the isosceles triangle is a right isosceles triangle because that leg opposite the hypotenuse is the height
Yes - the altitude of an equilateral triangle is perpendicular to the side chosen as the base and bisects that side and the opposite angle. Also, the altitude of an isosceles triangle when measured from the third side (the side that is not equal to the other two sides) is a perpendicular bisector of the base and also bisects the opposite angle.