Draw a triangle with an area of 12 square centimeters, and then divide it into two triangles. The ratio of their area is 1:3 The bottom and the top

Draw a triangle with an area of 12 square centimeters, and then divide it into two triangles. The ratio of their area is 1:3 The bottom and the top

1) Make line AB = 3cm and extend to C, so that AC = 12cm
2) DB ⊥ AC over B, and DB = 2 cm
3) Connecting Da, DC
S△DAB：S△DBC=1：3

Draw a triangle with an area of 48 square centimeters. The ratio of the bottom to the height is 4:3. What are the bottom and the height

Let the bottom be X
Because X: high = 4:3
So height = 3 / 4x (three quarters)
The countable equation x (3 / 4x) = 48
The solution is X1 = + 8
x2=-8
According to the meaning of the title, X2 should be omitted
So the bottom is 8cm
The height is 6cm
Do you learn quadratic equation?

Draw an area of 24 square centimeters, the ratio of bottom to height is 3 to 2

Triangle? If the base is 3x, the height is 2x
3x×2x÷2=24
x²=8
x=2√2,2√2×3=6√2,2√2×2=4√2
So the bottom is 6 √ 2 and the height is 4 √ 2
Parallelogram
3X*2X=24
6X²=24
x=2
The bottom is 6 and the height is 4