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Area - Facts & Formulae
>> Math Facts & Formula - Index Page
>> Learning Tools - Index Page
I.FACTS ON TRIANGLES:
Sum of the angles of a triangle is 180 degrees.
Sum of any two sides of a triangle is greater than the third side.
In a right angle triangle,
(Hypotenuse)^2 = (base)^2 + (Height)^2
The line joining the midpoint of a side of a triangle to the opposite vertex is called the MEDIAN
The point where the three medians of a triangle meet is called CENTROID.
Centroid divides each of the medians in the ratio 2:1.
In an isosceles triangle, the altitude from the vertex bi-sects the base
The median of a triangle divides it into two triangles of the same area.
Area of a triangle formed by joining the midpoints of the sides of a given triangle is one-fourth of the area of the given triangle.
II.FACTS ON QUADRILATERALS:
The diagonals of a parallelogram bisects each other .
Each diagonal of a parallelogram divides it into two triangles of the same area
The diagonals of a rectangle are equal and bisect each other.
The diagonals of a square are equal and bisect each other at right angles.
The diagonals of a rhombus are unequal and bisect each other at right angles.
A parallelogram and a rectangle on the same base and between the same parallels are equal in area.
Of all the parallelograms of a given sides , the parallelogram which is a rectangle has the greatest area.