DAV Class 6 Maths Chapter 12 Worksheet 2

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1. In the Given triangle name the -

(a) Vertex opposite of side QR.

Ans: Vertex P

(b) Side opposite of vertex Q.

Ans: Side PR

(c) Side opposite of vertex R.

Ans: Side PQ

(d) Vertex opposite of side PQ.

Ans: Vertex R

2. Draw any triangle ABC and mark the points -

(a) X, Y in the interior of the ΔABC.

Ans:

(b) R, S in the exterior of the ΔABC.

Ans:

3. What do you mean by triangular region?

Ans:

The interior of the triangle, together with the triangle is called the triangular region

Point X, Y, M, N lie in the triangular region.

4. Look carefully at the following figure and name-

(a) All the triangles formed.

Ans:8 triangles are formed

ΔOAB, ΔOBC, ΔOCD, ΔODA

ΔABC, ΔBCD, ΔCDA, ΔDAB

(b) All the triangles which have the point P in its exterior.

Ans:5 triangles are formed

ΔOBC, ΔOCD, ΔODA

ΔBCD, ΔCDA

(c) All the triangles which have the point P in its interior.

Ans:3 triangles are formed

ΔOAB, ΔABC, ΔABD

5. In the given figure, name the triangles which have -

(a) A as one vertex (any two).

Ans:7 triangles can be formed with vertex A.

ΔABC, ΔAFB, ΔAFC, ΔAFD, ΔAED, ΔAEC, ΔADC

You can write any two from above.

(b) B as one vertex (any two).

Ans:4 triangles can be formed with vertex B.

ΔBAC, ΔBAF, ΔBDF, ΔBDC

You can write any two from above.

(c) E as one vertex (any two).

Ans:4 triangles can be formed with vertex E.

ΔEAD, ΔEAC, ΔEDF, ΔEFC

You can write any two from above.

(d) DF as one side (any two).

Ans:4 triangles can be formed with side DF.

ΔDFB, ΔDFE, ΔDFC, ΔDFA

You can write any two from above.

(e) BC as one side.

Ans:2 triangles can be formed with side BC.

ΔBCA, ΔBCD

(f) AE as one side.

Ans:2 triangles can be formed with side AE.

ΔAED, ΔAEC