Triangles ABC and DEF are similar.

If $AB\ =\ 1.2\ cm$ and $DE\ =\ 1.4\ cm$, find the ratio of the area of two triangles.

Describe how the following expressions are obtained:$(i) 7 x y+5, (ii) x^{2} y, (iii) 4 x^{2}-5 x$.

What are sedimentary rocks?

What is the meaning of congruent?

A flooring tile has the shape of a parallelogram whose base is 24 cm and the corresponding height is 10 cm. How many such tiles are required to cover a floor of area $1080m^2$? (If required you can split the tiles in whatever way you want to fill up the corners).

Under which of the following conditions are you most likely to fall sick?

(a) when you are taking examinations.

(b) when you have travelled by bus and train for two days

(c) when your friend is suffering from measles. Why?

I can't understand about cockroaches respiration

Ammeter burns out when connected in parallel. Why?

$ 4 \frac{4}{5}+\left\{2 \frac{1}{5}-\frac{1}{2}\left(1 \frac{1}{4}-\frac{1}{4}-\frac{1}{5}\right)\right\} $

If area of $(ΔABC)\ =\ 36\ cm^2$, area $(ΔDEF)\ =\ 64\ cm^2$ and $DE\ =\ 6.2\ cm$, find $AB$.

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