Question

13
16. Plot the points A(-2, 1), B(4, 1), and C(1, 7) on a
Cartesian plane. Join AB, BC, and CA. What kind of
a polygon is ABC? Also, find its area.
7. Plot the points (-7, 3), (-4, 6), and (1, 1) on a
Cartesian plane. If these coordinates denote the three
vertices of a rectangle, then find the coordinate of the
fourth vertex and complete the rectangle.​

Answer 1

Answer:

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Answer 2

Answer:

Construct a line AM which is perpendicular to BC.

Area of ΔABC=

2

1

×b×h=

2

1

×BC×AM.

So on further calculation we get

Area of ΔABC=

2

1

×6×3

Area of ΔABC=9 sq. units