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## Answers

Area = ½ × b × h

b = base

h = vertical height

how to solve it

Since the area of a parallelogram is , the area of a triangle must be one-half the area of a parallelogram. Thus, the formula for the area of a triangle is: or where is the base, is the height and · means multiply.The base and height of a triangle must be perpendicular to each other. In each of the examples below, the base is a side of the triangle. However, depending on the triangle, the height may or may not be a side of the triangle.To find the area of a triangle, multiply the base by the height, and then divide by 2. The division by 2 comes from the fact that a parallelogram can be divided into 2 triangles.

And a=42cm , b=34cm , c=20cm

Now s=a+b+c/2

s=42+34+20/2

s=96/2

s=48cm

Putting these values in area of triangle

so, area of triangle=√s(s-a)(s-b)(s-c)

=√48(48-42)(48-34)(48-20)

=√48(6)(14)(28)

=√112896

=336 sq.cm