3: Look at following figure: AF/AB=1/4; AE/AC=1/3. If the area of triangle GBD is 270 m2 then the area of the triangle GCD is...m2

( Nhìn vào hình: AF/AB= 1/4; AE/AC=1/3. Nếu diện tích của tam giác GBD là 270m2 thì diện tích của tam giác GCD là...m2)

    a ,find the volume of the whole  figure in cm3 

b , we paint every side of the figure except for the bottom side .how many cubes  with side length 1 cm are there that have three faces painted ?

The length of each edge of a cube is 3 cm. The surface area of the cube, in cm2, is .............

(Chiều dài của mỗi cạnh của một khối lập phương là 3 cm. Diện tích bề mặt của khối lập phương, trong cm2, là .............)

The worker uses 12 cubic blocks to build a 2-step flight of stair as the figure below. To
prevent it from getting damaged, he covers all the surfaces of the stair with square
hard tiles of side length 15cm, except for the bottom. Find the total area of the hard
tiles needed for this stair in m2

If  of the figure below is colored then x = 
 

Question 9:
A square of side 8cm has the same perimeter as a rectangle. If the ratio of the width of the rectangle to its length is 1:3 then its area is  

Question 10:
The cost of a movie ticket is 5 dollars. The cost for 12 people to each of a movie ticket and a soft drink is 72 dollars. What is the cost of a soft drink? 
Answer:  dollars

the side of each small square in the figure is 4 cm. Calculate the area of the quadrilateral ABC.

Given a square with the length of one side is 8 cm and a isosceles triangle with the length of its base is 12 cm. If the area of the square is equal to the area of the isosceles triangle then what is the length of the height of the isosceles triangle, in cm? 

(Toán Tiếng Anh): The figure below is made of 2 squares of different sides (the length of sides are integer numbers). 
Find the perimeter of the figure if its area is .

1/- Look at the follwing figure AF/Ab=1/4 ; AB/AC=1/3 . If the area of triangle GBD is 270m2 then the area of the triangle GCD is ........ m2 ( có lời giải )