In Fig. , DE || BC (i) If DE = 4 cm, BC = 6 cm and area (∆ADE)= 16 cm2, find the area of ∆ABC. (ii) If DE = 4 cm, BC = 8 cm and area (∆ADE)=25 cm2, find the area of ∆ABC. (iii) If DE : BC = 3 : 5. Calculate the ratio of the areas of ∆ADE and the trapezium BCED.

In Fig. , DE || BC (i) If DE = 4 cm, BC = 6 cm and area ( $∆ A D E$ )= 16 $c m^{2}$ , find the area of $∆ A B C$ . (ii) If DE = 4 cm, BC = 8 cm and area ( $∆ A D E$ )=25 $c m^{2}$ , find the area of $∆ A B C$ . (iii) If DE : BC = 3 : 5. Calculate the ratio of the areas of $∆ A D E$ and the trapezium BCED.

Mixed-up sentence exercise

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