433 Un triangolo ha la base di 21 cm e l'altezza di 8 cm . Se si aumenta l'altezza di 2 cm di quan- to si deve aumentare o diminuire la base per mantenere invariata la superficie?

A circle whose centre \( (-2,5) \) passes through point \( P(10,10) \). Find the equation of the is the form of \( a x^{2}+b y^{2}+c x+d y+k=0 \). Where ab, c \( d \) and \( k \) are constants.

In a right triangle, if one angle measures 30 degrees, what is the measure of the other non-right angle?

If a sphere has a radius of 5 cm, what is its surface area? Use \( S = 4\pi r^{2} \).

The area of a trapezium is 34 cm 2 and the length of one of the parallel sides is 10 cm and ight is 4 cm . Find the length of the other parallel side.

Exercice : \( 2^{2} \) Soit \( A B C \) est un triangle rectangle en \( A \) tels que : \( A B=4 \) et \( A C=4 \sqrt{5} \) 1 Calculer : \( B C \) 2 Calculer : \( \sin \widehat{A B C}, \cos \widehat{A B C} \) et \( \tan \widehat{A B C} \) 3 Soit \( H \) le projeté orthogonal de \( A \) sur \( (B C) \). Calculer : \( A H \)