20m^2, et sa largeur est de 4 m. Quelle est sa longueur? (d) rectangle est de a) 5m b) 10 m c) 15 m d) 20 m 17)Sitaire d'un triangle est de 30cm^2 et que sa base est de 10 cm, quelle est sa hauteur? a) 3cm b) 6 cm c) 9cm d) 12cm

## Step 1: Calculate the length of the rectangle### The area of a rectangle is given by the formula . We are given the area ( ) and the width (4m). We can rearrange the formula to find the length: . Substituting the given values, we get .## Step 2: Calculate the height of the triangle### The area of a triangle is given by the formula . We are given the area ( ) and the base (10cm). We can rearrange the formula to find the height: . Substituting the given values, we get .