Class-10 Mathematics Triangles NCERT book English medium Part- 15 by Rahimuddin Sheikh

Exercise 6.4 8.ABC and B D E are two equilateral triangles such that D is the mid-point of BC .Ratio of the areas of triangles ABC and BD is (A) 2:1 (B) 1:2 (C) 4:1 (D) 1:4 9. Sides of two similar triangles are in the ratio 4:9 .Areas of these Triangles are in the ratio (A) 2:3 (B) 4:9 (C) 81:16 (D) 16:81