$ 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\} $

Triangles ABC and DEF are similar.

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

If $AC\ =\ 19\ cm$ and $DF\ =\ 8\ cm$, find the ratio of the area of two triangles.

If area $(ΔABC)\ =\ 9\ cm^2$, area $(ΔDEF)\ =\ 64\ cm^2$ and $DE\ =\ 5.1\ cm$, find $AB$.

If area of $(ΔABC)\ =\ 16\ cm^2$, area $(ΔDEF)\ =\ 25\ cm^2$ and $BC\ =\ 2.3\ cm$, find $EF$.

In figure below, $∠A\ =\ ∠CED$, prove that $ΔCAB\ ∼\ ΔCED$. Also find the value of $x$.

A vertical stick 10 cm long casts a shadow 8 cm long. At the same time, a tower casts a shadow 30 m long. Determine the height of the tower.

Formation of curd from milk is a/ ani. physical and irreversible changeii. irreversible and desirable changeiii. chemical and undesirable changeiv. physical and desirable change

The charge on an electron is $1.6\times10^{-19}$ C. Find the number of electrons that will flow per second to constitute a current of 2A?

If $Δ\ ABC$ and $Δ\ AMP$ are two right triangles, right angled at $B$ and $M$, respectively such that $∠MAP\ =\ ∠BAC$. Prove that:

(i) $ΔABC\ ∼\ ΔAMP$

(ii) $\frac{CA}{PA}\ =\ \frac{BC}{MP}$

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