No, a triangle is defined by its three sides and/or its angels. The diameter is a characteristic of a circle.
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The diameter is the distance across the centre of the circle.
Its diameter.
A triangle with sides of 4.76 inches or less.
The length of the circle's diameter
An isosceles triangle is usually drawn with the two sides of equal length as the legs and the third side as the base. For a right angled isosceles triangle then the hypotenuse is drawn as the base with the two sides of equal length as the legs joining together at a right angle. Draw a circle. Draw a horizontal diameter with a second diameter perpendicular to the first. The hypotenuse is the horizontal diameter. Draw lines from the ends of this diameter to the point where one end of the second diameter meets the circumference. These are the two equal legs of the isosceles triangle. These legs meet at an angle of 90° .