1 A 1 B 1 C 2 3 4 5 6 A 6 B 7 8 9 10 11 A 11 B 11 C 11 D 11 E 12 A 12 B 12 C 12 D 12 E

West Bengal Mathematics

20. Co-ordinate Geometry: Area of Triangular Region

1. Real Numbers
2. Laws of Indices
3. Graph
4. Co-ordinate Geometry: Distance Formula
5. Linear Simultaneous Equations
6. Properties of Parallelogram
7. Polynomial
8. Factorisation
9. Transversal and Mid-Point Theorem
10. Profit and Loss
11. Statistics
12. Theorems on Area
13. Construction: (Construction of a Parallelogram whose measurement of one angle is given and equal in area of a triangle)
14. Construction: (Construction of a triangle equal in area of a quadrilateral)
15. Area and Perimeter of Triangle and Quadrilateral Shaped Region
16. Circumference of Circle
17. Theorems on concurrence
18. Area of Circular Region
19. Co-ordinate Geometry: Internal and External Division of Straight Line Segment
20. Co-ordinate Geometry: Area of Triangular Region
21. Logarithm

Let us Calculate 20

1 A 1 B 1 C 2 3 4 5 6 A 6 B 7 8 9 10 11 A 11 B 11 C 11 D 11 E 12 A 12 B 12 C 12 D 12 E

Q. 11 C3.7( 11 Votes )

ABC is a right-an A. 12 sq. unit

B. 6 sq. unit

C. 24 sq. unit

D. 8 sq. unit

Class 9th West Bengal Mathematics 20. Co-ordinate Geometry: Area of Triangular Region

Answer :

Point B can either be origin or (3, 4) as shown

Consider B to be the origin

Base of ΔABC = BC = 3 units

Height of ΔABC = AB = 4 units

Thus, area = × base × height

⇒ area = × 3 × 4 = 6 unit²

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