mathematics powerpoint presentation for class 9th

2. A triangle is a polygon with three edges and three
vertices. It is one of the basic shapes in geometry. A
triangle with vertices A, B, and C is denoted △ A B C .
In Euclidean geometry any three points, when non-
collinear, determine a unique triangle and a unique
plane (i.e. a two-dimensional Euclidean space). This
article is about triangles in Euclidean geometry
except where otherwise noted.

3. types of triangle

4. In Euclidean geometry, a parallelogram is a simple
quadrilateral with two pairs of parallel sides. The
opposite or facing sides of a parallelogram are of
equal length and the opposite angles of a
parallelogram are of equal measure. The congruence
of opposite sides and opposite angles is a direct
consequence of the Euclidean parallel postulate and
neither condition can be proven without appealing to
the Euclidean parallel postulate or one of its
equivalent formulations.

5. Types of parallelograms

6. To find the area of a triangle, multiply the
base by the height, and then divide by 2.
the formula for the area of a triangle is:
or

7. A parallelogram is a 4-sided shape formed
by two pairs of parallel lines. Opposite sides
are equal in length and opposite angles are
equal in measure.
To find the area of a parallelogram, multiply
the base by the height.
The formula is : Area=b*h where is the
base, is the height, and · means multiply.

10. MADE BY : DIGAMBAR PATIL
ROLL NO : 21
CLASS :9TH A