PPT: The Triangles and its properties | Mathematics (Maths) Class 7 (Old NCERT) PDF Download

 Page 1


TRIANGLES AND ITS
PROPERTIES
TRIANGLES AND ITS
PROPERTIES
Page 2


TRIANGLES AND ITS
PROPERTIES
TRIANGLES AND ITS
PROPERTIES
The line segment AD, joining the
mid-point of BC to its opposite
vertex A is called a Median of the
triangle.
MEDIANS OF A
TRIANGLE
Page 3


TRIANGLES AND ITS
PROPERTIES
TRIANGLES AND ITS
PROPERTIES
The line segment AD, joining the
mid-point of BC to its opposite
vertex A is called a Median of the
triangle.
MEDIANS OF A
TRIANGLE
Line segment AL is an altitude of the
triangle. 
An altitude has one end point at a
vertex of the triangle and the other
on the line containing the opposite
side. Through each vertex, an
altitude can be drawn.
ALTITUDES OF A
TRIANGLE 
Page 4


TRIANGLES AND ITS
PROPERTIES
TRIANGLES AND ITS
PROPERTIES
The line segment AD, joining the
mid-point of BC to its opposite
vertex A is called a Median of the
triangle.
MEDIANS OF A
TRIANGLE
Line segment AL is an altitude of the
triangle. 
An altitude has one end point at a
vertex of the triangle and the other
on the line containing the opposite
side. Through each vertex, an
altitude can be drawn.
ALTITUDES OF A
TRIANGLE 
EXTERIOR ANGLE PROPERTY
An exterior angle of a triangle
is equal to the sum of its
interior opposite angles.
?A + ?B = ?ACD
Page 5


TRIANGLES AND ITS
PROPERTIES
TRIANGLES AND ITS
PROPERTIES
The line segment AD, joining the
mid-point of BC to its opposite
vertex A is called a Median of the
triangle.
MEDIANS OF A
TRIANGLE
Line segment AL is an altitude of the
triangle. 
An altitude has one end point at a
vertex of the triangle and the other
on the line containing the opposite
side. Through each vertex, an
altitude can be drawn.
ALTITUDES OF A
TRIANGLE 
EXTERIOR ANGLE PROPERTY
An exterior angle of a triangle
is equal to the sum of its
interior opposite angles.
?A + ?B = ?ACD
The total measure of the three
angles of a triangle is 180°.
ANGLE SUM
PROPERTY
?A + ?B + ?C = 180°