Triangles `A B C` and `D E F` are similar. If area `( A B C)=36\ c m^2` , area `( D E F)=64\ c m^2` and `D E=6. 2 c m ,` find `A Bdot` (ii) If `A B=1. 2 c m` and `D E=1. 4 c m` , find the ratio of the areas of ` A B C` and ` D E F` .

If A B C ∼ D E F such that A B=1. 2 c m and D E=1. 4 c m . Find the ratio of areas of A B C and D E F .

Triangles A B C and D E F are similar. If area ( A B C)=16\ c m^2 , area ( D E F)=25\ c m^2 and B C=2. 3 c m , find E Fdot (ii) If area ( A B C)=9\ c m^2 , area ( D E F)=64\ c m^2 and D E=5. 1 c m , find A Bdot (iii) If A C=19 c m and D F=8c m , find the ratio of the area of two triangles.

If ΔA B C ∼ ΔD E F such that A B=5c m , area (Δ A B C)=20\ c m^2 and area (Δ D E F)=45\ c m^2 , determine D E .

If A B C and D E F are similar triangles such that 2\ A B=D E and B C=8c m , then E F=

In A B C ,\ D and E are the mid-points of A B and A C respectively. Find the ratio of the areas of A D E and A B C .

If ΔA B C ∼ ΔD E F such that area of ΔA B C is 9\ c m^2 and the area of ΔD E F is 16\ c m^2 and B C=2. 1 cm. Find the length of E F .

In Fig. 4.178, D E∥ B C (FIGURE) (i) If D E=4c m , B C=6c m and Area ( A D E)=16\ c m^2 , find the area of A B C . (ii) If D E=4c m , B C=8c m and Area ( A D E)=25\ c m^2 , find the area of A B C . (iii) If D E : B C=3:5 . Calculate the ratio of the areas of A D E and the trapezium B C E D .

If /_\A B C and /_\D E F are similar triangles such that A B=3c m , B C=2c m C A=2. 5 c m and E F=4c m , find the perimeter of D E F .

A B C D E F , a r( A B C)=9c m^2 , a r( D E F)=16 c m^2 . If B C=2. 1 c m , then the measure of E F is 2. 8 c m (b) 4. 2 c m (c) 2. 5 c m (d) 4. 1 c m

If Delta A B C ~ Delta D E F such that B C=3c m , E F=4c m and a r( A B C)=54 c m^2 , then a r( D E F)=