Question
21)Quolle est ('aire d'un trapeze avec une base de 8 cm, une autre base de 6 cm, et une hauteur 5cm? a) 35cm^2 b) 50cm^2 c) 70cm^2 d) 60cm^2 22) Quel est le périmètre d'un rectangle de 5 m de longueur et 3 m de largeur? a) 8m b) 16 m c) 15 m d) 18 m 23)Quelle est l'aire d'un triangle équilatéral dont le côté mesure 6 cm? a) 36sqrt (3)/4cm^2 b) 18sqrt (3)cm^2 C) 9sqrt (3)/4cm^2 d) 24sqrt (3)cm^2 24)L'aire d'un cercle est de 50.24cm^2 Quel est son rayon (pi approx 3.14) 7 a) 4cm b) 5cm c) 6cm d) 7cm 25) Comment calcule-t-on l'aire totale d'un cube? a) 4times Cacute (o)tacute (e)^2 b) 6times Cacute (o)tacute (e)^2 c) Chat (o)te^2 d) Chat (o)tacute (e)^3 26) Quelle est la formule pour calculer le volume d'un cube? a) cacute (o)tacute (e)times cacute (o)tacute (e) b) cacute (o)tacute (e)times cacute (o)tacute (e)times cacute (o)tacute (e) c) cacute (hat (o))tacute (e)+cacute (o)tacute (e)+cacute (o)tacute (e) d) cacute (o)tacute (e)times 3 27) Quel estle volume d'un cube dont le côté mesure AC a) 12cm^3 b) 16cm^3 c) 64cm^3 d) 48cm^3
Solution
3.8
(391 Votes)
Edith
Professional · Tutor for 6 years
Answer
21) The area of a trapezoid is given by the formula: A = (1/2) * (b1 + b2) * h, where b1 and b2 are the lengths of the two bases, and h is the height. In this case, b1 = 8 cm, b2 = 6 cm, and h = 5 cm. So, A = (1/2) * (8 + 6) * 5 = (1/2) * 14 * 5 = 35 cm². Therefore, the answer is **a) 35cm²**.22) The perimeter of a rectangle is given by the formula: P = 2 * (length + width). In this case, the length is 5 m and the width is 3 m. So, P = 2 * (5 + 3) = 2 * 8 = 16 m. Therefore, the answer is **b) 16 m**.23) The area of an equilateral triangle with side length 's' is given by the formula: A = (√3/4) * s². In this case, s = 6 cm. So, A = (√3/4) * 6² = (√3/4) * 36 = 9√3 cm². Therefore, the answer is **b) 9√3 cm²** (Note: There appears to be a typo in the options provided. Option 'b' should likely be 9√3 cm², not 18√3 cm²).24) The area of a circle is given by the formula: A = πr², where r is the radius. We are given A = 50.24 cm² and π ≈ 3.14. We need to solve for r. 50.24 = 3.14 * r². Dividing both sides by 3.14 gives r² = 16. Taking the square root of both sides gives r = 4 cm. Therefore, the answer is **a) 4cm**.25) The total surface area of a cube is given by the formula: 6 * side². Therefore, the answer is **b) 6 × Côté²**.26) The volume of a cube is given by the formula: side * side * side = side³. Therefore, the answer is **b) côté × côté × côté**.27) The volume of a cube is given by side³. If the side length is 4 cm, the volume is 4³ = 4 * 4 * 4 = 64 cm³. Therefore, the answer is **c) 64cm³**.