Hello students here we are going to discuss the angles of triangles and angles of polygons. But before discussing it you should get familiar with the term 'angle'. If two rays OP and OQ have a common end point ‘O’ then it form angle POQ, written as ∠POQ.
Angle may be interior, if any point in its (∠ POQ) plane lies on the same side of OP as Q and also on the same side of OQ as P and exterior of an angle has points in its plane which do not lie on the angle or in its interior.
Angle is of following types such as: right, acute, obtuse, straight, reflex and complete angles.
Let us take a look at Angles of triangles: Suppose we have a triangle ∠ABC, the interior of this triangle is the set of all points in its plane, which lies on the same side of OP as ‘Q’ and also on the same side of OQ as P or in other words if any angle is inside the boundary of the triangle then it said to be interior angle of the triangle and if any angle is outside the boundary of the triangle then it said to be exterior angle
Note: - The interior angles of a triangle can add up to the 180°. (know more about icse class 10 books, here)
Angles of polygons: Polygons are the shapes that have more than two angles or have straight sides. Example triangle, rectangle, and rhombus, etc. Interior angles are those which lie inside the boundary and vice versa.
Note: The exterior angles of a polygon can add up to the 360°.
Above information will be useful for the Grade IX students.
In the next session we are going to discuss Error and magnitude.
.
Angle may be interior, if any point in its (∠ POQ) plane lies on the same side of OP as Q and also on the same side of OQ as P and exterior of an angle has points in its plane which do not lie on the angle or in its interior.
Angle is of following types such as: right, acute, obtuse, straight, reflex and complete angles.
Let us take a look at Angles of triangles: Suppose we have a triangle ∠ABC, the interior of this triangle is the set of all points in its plane, which lies on the same side of OP as ‘Q’ and also on the same side of OQ as P or in other words if any angle is inside the boundary of the triangle then it said to be interior angle of the triangle and if any angle is outside the boundary of the triangle then it said to be exterior angle
Note: - The interior angles of a triangle can add up to the 180°. (know more about icse class 10 books, here)
Angles of polygons: Polygons are the shapes that have more than two angles or have straight sides. Example triangle, rectangle, and rhombus, etc. Interior angles are those which lie inside the boundary and vice versa.
Note: The exterior angles of a polygon can add up to the 360°.
Above information will be useful for the Grade IX students.
In the next session we are going to discuss Error and magnitude.
.
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