The area of a rectangle and a square is 324 square centimeters, and the area of a circle is 314 square centimeters. Among the three figures, () has the longest perimeter The area of a rectangle and a square is 324 square centimeters, and that of a circle is 314 square centimeters. Among the three figures, () has the longest perimeter and () the shortest perimeter

The area of a rectangle and a square is 324 square centimeters, and the area of a circle is 314 square centimeters. Among the three figures, () has the longest perimeter The area of a rectangle and a square is 324 square centimeters, and that of a circle is 314 square centimeters. Among the three figures, () has the longest perimeter and () the shortest perimeter

The area of a rectangle and a square is 324 square centimeters, and the area of a circle is 314 square centimeters. Among the three figures, the circumference of (rectangle) is the longest and that of (circle) is the shortest
The side length of the square is 18cm and the perimeter is 72cm
The diameter of the circle is 20 cm and the circumference is 62.8 cm

Four mutually unequal integers a.b.c.d, their product ABCD is equal to 9, then what is a + B + C + D equal to

If the product of four different integers is 9, then the sum is 0
9=(-1)*1*(-3)*3=9
(-1)+1+(-3)+3=0

It is known that the central angle of a sector is 72 degrees and the radius is 20 mm

The area of the sector is π × 20 × 20 × 72 △ 360 = 251.2mm & # 178;

How to calculate the number of items in arithmetic sequence with negative first term
And how to calculate the number of items whose first and last items are all negative? Are there two cases that the first item is larger than the last item and the first item is smaller than the last item?

No
an=a1+(n-1)d
So the solution is n = (an-a1) / D + 1
N is the number of terms

English composition for junior one (50 words)
My family

My family lives in, but my family doesn't. He lives in China. My family name is Jian. I have one brother and one sister. My name is Jeff. My brother's name is art. My sister's name is Sophia. My father's name is Jian Zong he and my mother's name is Jenny. I like to watch TV and play PC games. My brother likes them, too father and my mother both like to watch TV. My brother and I are both junior high school students. My father is a businessman. My mother is a businesswoman. I like my family very much.

(2014. The second mock exam in Anqing) in the plane rectangular coordinate system, we take the following five points from A, 0 (0), B (2, 0), C (1, 1), D (0, 2), E (2, 2).
A. 25B. 35C. 45D. 1

Take 3 out of 5 points, and list ABC, abd, Abe, ACD, ACE, ADE, BCD, BCE, BDE, CDE, there are 10 basic events, in which ace and BCD are collinear, and the other 8 are consistent with the meaning of the question, so the probability of forming a triangle is 810 = 45

There is a cuboid with a surface area of 184 square centimeters, a bottom area of 20 square centimeters, and a bottom perimeter of 18 centimeters. The cuboid has a volume of______ Cubic centimeter

20 × [(184-20 × 2) △ 18], = 20 × [(184-40) △ 18], = 20 × [144 △ 18], = 20 × 8, = 160 (cubic centimeter). Answer: the volume of this cuboid is 160 cubic centimeter. So the answer is: 160

Given cosa = 1 / 2, a &; (0, Pai / 2) 0 (1) find the value of Tana (2) sin (a + Pai / 6)

A:
0

X1 and X2 are the two real roots of the equation x ^ 2-2x-1 = 0. Solve the equation to find the value of X1 / x2

According to the relation between the root and coefficient of quadratic equation of one variable (Weida's theorem), X1 + x2 = 2, after the square, we get: X1 ^ 2 + x2 ^ 2 = 6, x1x2 = - 1, comparing the two formulas, X1 / x2 + x2 / X1 = - 6, let X1 / x2 = u, X2 / X1 = 1 / u, U + 1 / u = - 6, u = 3 ± 2 √ 2,
x1/x2=3±2√2.

Let f (x) be an odd function defined on R

When x = 0, f (x) = - x ^ 2
4f (x + T) is to shift f (x) to the left in t units, and multiply the ordinate by 4
No intersection f (x) > 4f (x + T) holds when x0
So t + 2