CBSE Class 10-Mathematics: Chapter –7 Coordinate Geometry Part 20
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Question 8:
Find the area of the quadrilateral whose vertices taken in order are and .

Find the Area of the Quadrilateral
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Answer:
Area of quadrilateral . units.
Question 9:
The vertices of are and . A line is drawn to intersect sides AB and AC at D and E respectively such that .
Calculate the area of the and compare it with the area of

A Line is Drawn to Intersect Sides
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Answer:
Now coordinate of D and E are
Question 10:
Prove that the points are the vertices of an equilateral triangle. Calculate the area of this triangle.
Answer:
Let