No because a quadrilateral has 4 sides whereas a triangle has 3 sides.
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No. A quadrilateral is a plane shape with four straight sides, a triangle has 3 sides. Changing the size of an angle does not alter the number of sides!
A right angle triangle
It is the right angle triangle which has 3 sides whereas all quadrilaterals have 4 sides.
it is a somehow slanted triangle.
A right angle triangle
Yes. That is why it is called a right angle triangle!Yes. That is why it is called a right angle triangle!Yes. That is why it is called a right angle triangle!Yes. That is why it is called a right angle triangle!