77. Il perimetro di un triangolo misura 90 dm . Sapendo che il secondo lato supera il primo di 4 dm e il terzo lato supera il primo di 11 dm , calcola l'area del triangolo. [ \( \left.360 \mathrm{dm}^{2}\right] \)

a) Hur många procent kortare är triangelns höjd jämfört med dess bas? Svar:

\( \underline{\text { Exercice } 2} \) Dans l'espace muni d'un repère orthonormal, on donne les points : . 1. Vérifier que l'équation cartésienne du plan (BCD) est : 2. Déterminer les coordonnées du point H projeté orthogonal du point A sur le plan 3. Calculer le produit scalaire : .

David needs to fence his country house block to keep his dog in. The block is a rectangle with length 30 m and breadth 25 m . Fencing costs \( \$ 12 \) per metre. What will be he total cost of fencing?

Progress: \( 31 / 1155 \) 4. Qual é a distância entre os pontos das abcissas -5 e -1 ? \( \begin{array}{lll}\text { A } 10 & \text { B } 8 & \text { C } 6\end{array} \) \( \begin{array}{ll}\text { 5. Qual é o valor de }|5+\sqrt{8}|\end{array} \) ?

A rectangular prism has a volume of \( 3 \mathrm{~m}^{3} \), a length of 30 cm , and a width of 40 cm . What is the height of the prism?