Un rombo ha le diagonali di \( 12,8 \mathrm{~cm} \) e \( 9,6 \mathrm{~cm} \). Calcola la misura del raggio della circonferenza la cui lunghezza è congruente al perimetro del rombo. \( \left[\frac{16}{\pi} \mathrm{~cm}\right] \)

Exercice 2 Dans un repere orthonorme \( (O, \vec{i}, j) \) on considére les points \( A(-2,1) ; B(0 ;-2) ; C(1 ; 3) \). 1) Calculer \( A B ; A C ; B C \) et \( \overline{A B} \cdot \overline{A C} \) 2) Déduire la nature du triangle \( A B C \) 3) Calculer la surface ditriangle \( A B C \) 4) Calculer \( \overline{B C} \cdot \overline{B A} ; \cos (\overline{B C} ; \overline{B A}) ; \sin (\overline{B C} ; \overline{B A}) \) et dedduire la mesure principale de l'angle \( (\overline{B C} ; \overline{B A}) \)

A brace for a shelf has the shape of a right triangle. Its hypotenuse is 12 inches long and the two legs are equal in length. How long are the legs of the triangle? The legs of the triangle both have a length of (Simplify your answer. Type an exact answer, using radicals as needed. Use integers or fractions for any numbers in the expression. Rationalize all denominators.)

Calcula el área y perimetro del rectángulo, si su altura es de 21 cm y su diagonal mide 29 cm Si ABCD es un trapecio isósceles, calcular su área y perimetro.

45. Çevrə dörd nöqtə ilə \( 2: 3: 8: 7 \) nisbətində bölünmüsdür. Təpələri həmin nöqtələrdə olan dördbucaqlının böyük bucağın tapın.

Prove that the circle is equal to chords