ABCD is an isosceles trapezoid so \(AD=BC\)
\(\Rightarrow CD=4AD\)
\(4AB=3CD\Rightarrow AB=\dfrac{3}{4}CD=\dfrac{3}{4}.4AD=3AD\)
Then:
\(AB+BC+CD+AD=81\)
\(3AD+AD+4AD+AD=81\)
\(9AD=81\)
\(AD=9\left(cm\right)\)
three lines dissect a big triangle into four triangles and three quadrilaterals. the sum of the perimeters of the three quadrilateral is 25 cm, the sum of the perimeters of the four triangle is 20 cm. the perimeter of the big triangle is 19 cm. how big is the sum of the lengths of the three dissecting lines?
"A string is wound symmetrically around a circular rod. The string goes exactly 4 times around the rod. The circumference of the rod is 4 cm. and its length is 12 cm. Find the length of the string? Show all your work."
Tạm dịch là:
“Một sợi dây được quấn đối xứng 4 vòng quanh một ống trụ tròn đều. Ống trụ có chu vi 4 cm và độ dài là 12 cm.
Hỏi: Sợi dây dài bao nhiêu cm? Giải thích cách làm”.
The area of the dining room at thomas jefferson's home in monticello is about 342 square feet. If the approximate length of the one side is a 2-digit prime number, what are the approximate dimensions of the room?
Given the rectangular land and its length is 3/4 km . Its width is shorter than its length by 1/12 km.
Then the area of land is ......... km2 (round to one decimal place)
Given the rectangular land and its length is 3/4 km . Its width is shorter than its length by 1/12 km.
Then the area of land is ......... km2 (round to one decimal place)
Fill in the blank with the suitable number (Note: write decimal number with "the dot" between number part and fraction part. Example: 0.5)
Question 1:
Given .
Calculate: .
Question 2:
Given two triangles and .
If and then .
Question 3:
Suppose that is directly proportional to with the scaling factor is .
If and then k=.
Question 4:
In this figure, find the value of ?
Answer: .
(write your answer by decimal in simplest form)
Question 5:
Find the value of ?
Answer: .
(write your answer by decimal in simplest form)
Question 6:
Given two triangles and .
If and then the perimeter of is .
Question 7:
In this figure, .
Question 8:
The value of .
(write your answer by decimal in simplest form)
Question 9:
The perimeter of a triangle is and the sides of its are in a ratio of .
Then the sides's length of the triangle are .
(write your answer from least to greatest and used ";")
Question 10:
Fill the suitable number in the "?".
Answer: .
giúp mik vs nha please
Given two triangle MNP and BCD. Suppose that tam giác MNP = BCD and MN= 1.2m MP= 0.9m CD=1.3m
The perimeter of MNP is ..................cm?
Giúp mình đi mình tich cho
Given the rectangular land and its length is \(\frac{3}{4}km\). Its width is shorter than its length by \(\frac{1}{12}\) .
Then the area of land is \(km^2\)
(round to one decimal place)
The length of three sides of a triangle is proportional to 2; 3; 4.Three heights corresponding to those 3 sides are proportional to which 3 numbers?
