Depending how you halve it can be a right angle triangle or an isosceles trapezoid
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90° . That's true of any triangle. Doesn't have to be isosceles.
isosceles triangle
Are isosceles triangle sometimes an equilateral triangle
An obtuse triangle is not necessarily isosceles, but it can be.
Perimeter of the isosceles triangle: 16.2+16.2+8.1 = 40.5 cm