It is a Triangle.
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multiply the base of the triangle by the height then halve the answer.
Depending how you halve it can be a right angle triangle or an isosceles trapezoid
what shape is not a triangle but has 3 sides
If a regular 2D shape - a square or rectangle - times the length by the width to get the area.If the shape is irregular than drawing squares inside the shape will aid in finding the total area. There are other ways worth studying.The area of a right-angle triangle is half the size of a rectangle or square. The triangle's base x side will give the area of the rectangle or square. Dividing by 2 will halve the rectangle or square, so giving the area of the right-angle triangle.
A triangle is a geometric shape.