What type of polygon is Arrowhead?
Arrowheads are special as they are concave. All the other quadrilaterals are convex. ‘Polygon’ is the name for any shape that is drawn with straight sides. A regular polygon has equal sides and equal angles.
What is an arrowhead in geometry?
2Geometry. A quadrilateral in which one internal angle is more than 180°.
What is the sum of angles in an arrowhead?
Furthermore the interior and exterior angles at a point always add up to 180°.
What is the DOT called in geometry?
point
A point is the most fundamental object in geometry. It is represented by a dot and named by a capital letter.
What is a diagonal of a quadrilateral?
A line segment drawn from one vertex of a quadrilateral to the opposite vertex is called a diagonal of the quadrilateral. For example, AC is a diagonal of quadrilateral ABCD, and so is BD.
What makes an arrow head a concave quadrilateral?
An arrow head is a concave quadrilateral, i.e. it has a dent in it. More mathematically, we say that one of the interal angles is a reflex angle (i.e. greater than 180 o ). This is the one defining characteristic of an arrowhead.
Which is the defining characteristic of an arrowhead?
This is the one defining characteristic of an arrowhead. Any quadrilateral which doesn’t fall into one of the seven categories above is termed a scalene quadrilateral. They generally have no angles equal, no sides equal (although it is just about possible to draw a scalene quadrilateral with two equal sides) and no sides parallel.
What do arrows mean in a quadrilateral diagram?
In the following diagrams, the arrows indicate lines which are parallel. All the lines with just one arrow on them are parallel to all the other lines with just one arrow on them. All the lines with a double arrow on them are parallel to all the other lines with a double arrow on them. Similarly, a dash on a line indicates lines of the same length.
Which is true of a concave quadrilateral ABCD?
Since all the interior angles of the given quadrilateral ABCD measure less than 180°, it is a convex quadrilateral. A concave quadrilateral is a quadrilateral having at least one of its interior angles measuring more than 180°. One of the diagonals of a concave quadrilateral lies outside the closed figure.