In a triangle, if the second angle is 2 times the first angle and the thir angle is 3 times the first ange, find the angles of the triangle.

Fig 9.16 \( A B C \) is isosceles with \( A B=A C=7.5 \mathrm{~cm} \) and \( \mathrm{BC}=9 \mathrm{~cm} \) (Fig 9.17). The height \( A D \) frum \( A \) to \( B C \), is 6 cm . Find the area of \( \triangle A B C \). What will be the height from \( C \) wABie., \( C E \) ?

Two lines \( \mathbf{r}_{1}(t)=[1+2 t, 3-t, 4+3 t] \) and \( \mathbf{r}_{2}(s)=[2+3 s, 1+s, 5-s] \) are:

The plane with the equation \( 3 x+2 y-z=6 \) has a normal vector:

Выяснить геометрический смысл соотношения \( \operatorname{Rez}=3 \)

Gianni ha costruito per sua figlia Nadia un aquilone a forma di deltoide con della stoffa colorata e due listelli lunghi 60 cm e 48 cm . Quanto misura la superficie dell'aquilone?