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 .

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

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