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Java defines a rectangle, including method, perimeter and area
Static void Juxing (double x, double y) {/ / X and y are length, width, double D = 2 * x + 2 * y; / / perimeter, double S = x * y; / / area System.out.println (rectangle perimeter is + D); System.out.println ("rectangle area: + s);} public static void main (string [] a
How to calculate the area, volume and perimeter of a rectangle? What's the meaning of area, volume and perimeter?
Area of rectangle = length x width, rectangle has no volume, perimeter = (length + width) * 2,
It means: the area in the plane, the volume in the space, the perimeter, the sum of the four sides,
The concept of perimeter and area
Standard
The sum of all sides of a figure is called the circumference of the figure
The size of the surface or enclosed plane figure of an object is called its area
Given the three vertices a (4,3), B (7, - 5), C (- 1, - 2) of ABC, find the perimeter of the triangle
AB=√[(4-7)²+(3+5)²]=√73
AC=√[(4+1)²+(3+2)²]=5√2
BC=√[(7+1)²+(-5+2)²]=√73
So perimeter = 2 √ 73 + 5 √ 2
Why is the perimeter of a triangle made up of a point inside the triangle and any two points of the triangle always smaller than the original?
Mathematics in grade one
Take a point O inside the triangle ABC to connect OB and OC
It is proved that ab + AC > ob + OC
First of all, we extend Bo to d
ab+ad>bd
The sum of DC + od > OC is greater than that of the third side
So AB + AD + DC + od > BD + OC
Go through and move to
ab+ac>ob+oc
Determine two points of the triangle, and the other point moves on a straight line. When this point is at what position, the perimeter of the triangle is the smallest?
Make sure that the two points are on the same side of the line.
Make a symmetry point of a certain point about a straight line, and then connect the line between this symmetry point and another certain point with the intersection point of the straight line. When this point is at this intersection point, the perimeter of the triangle is the smallest
Find a point on one line and form the shortest perimeter of triangle with another line
There are two points on one side of a straight line. The distance between a, B and ab is a fixed value. Find a point C on the straight line to make the perimeter of the triangle formed by a, B and C shortest. How to find such a point C
1. 2. In the same plane, two lines are not parallel. Select a point a or B which is closest to the other line as the vertical line and intersect with the other line at point C, so the perimeter of triangle ABC is the shortest. 3. In the same plane, two lines are parallel, and make the vertical line at the midpoint of point a and B, and intersect with the other line at point C, so the perimeter of triangle ABC is the shortest
The circumference of the triangle is () cm, which is formed by three lines of 12cm, 6cm and 7cm
Problem: the circumference of a triangle is (25) cm with three lines of 12 cm, 6 cm and 7 cm
Formula: 12 + 6 + 7 = 25 (CM)
Given that the ratio of three sides of a triangle is 4:6:7, and the difference between the shortest side and the longest side is 6cm, the perimeter of the triangle is 5cm
We heard the story of the tortoise and rabbit race when we were young. We all know that the tortoise defeated the little white rabbit in the end. If the little white rabbit knew the shame in the second race and then braved, when he was 1000 meters behind the tortoise, he would catch up with the tortoise at the speed of 101 meters per minute, but the tortoise still crawled at the speed of 1 meter per minute, then the little white rabbit would only need minutes to catch up with the tortoise
It is known that X / 2 + M = 2x-m
When m = 2, find the value of X
When x = 2, find the value of M
Come on, come on!!!!!! It's urgent
It takes about X minutes for a rabbit to catch up with a turtle,
According to the meaning of the title, we can get 101x = x + 1000
The solution is x = 10
It will take about 10 minutes for the rabbit to catch up with the tortoise
Given that the ratio of three sides of a triangle is 4:6:7, and the difference between the shortest side and the longest side is 12 cm, what is the circumference of the triangle?
12÷（7-4）×（4+6+7）
=12÷3×17
=68 cm
The circumference is 68 cm
RELATED INFORMATIONS
- 1. In triangle ABC, C is a right angle. Given AC = 2, CD = 2, CB = 3, am = BM, what is the area of triangle amn (shadow part)?
- 2. If the side lengths of ABC and def are 6,5,8 and 30,25,40 respectively, So this triangle - yes, or no - is similar to a triangle, according to-
- 3. In △ ABC and △ def, ab = De, BC = EF, and ∠ B and ∠ e complement each other
- 4. In ABC, AC = 15, BC = 13 and CD = 12, what is the area?
- 5. In the triangle ABC, AC = 13, BC = 15, height CD = 12, then its area is?
- 6. In △ ABC, ∠ C = 60 °, BC = a, AC = B, AC + BC = 8, write the functional relationship between the area s and side length a of △ ABC and the value range of independent variable a
- 7. Given the length of the three sides of a triangle, how to find the height of the triangle?
- 8. Given the length of three sides of a triangle, how to find the area of the triangle? Such as the title
- 9. Given the length of the three sides of a triangle, can we find the area? How? And we don't give the degree of the angle
- 10. In triangle ABC, edge B = 2, diagonal B = 30 degrees, find the maximum area of triangle?
- 11. Three points D, e and F are obtained by extending the three sides of the triangle ABC by 1, 2 and 3 times, respectively. The area of the triangle ABC is 10 square centimeters, and the formula of the triangle DEF is obtained
- 12. For a trapezoid, if the bottom and height remain unchanged, the area of the trapezoid will increase by 1.2 square meters if the top and bottom increase by 0.6 meters; if the top and bottom remain unchanged, the height will decrease by 0.8 meters, and the area of the trapezoid will decrease by 2 square meters?
- 13. The bottom of the trapezoid is 12 meters, 2 meters more than the top, and the height is 4 meters. How many square meters is the area of the trapezoid
- 14. There is a trapezoid. If the upper bottom is increased by 2 meters, the lower bottom and height will not change. Its area will increase by 4.8 square meters. If the upper bottom and the lower bottom are both unchanged, and the height is increased by 2 meters, its area will increase by 8.5 square meters. Find the area of the original trapezoid
- 15. In △ ABC, ab = 10cm, BC = 16cm, ad = 6cm, AC
- 16. If both sides of a right triangle are 5 cm and 12 cm long, what is the area of the triangle? There are two cases
- 17. The bottom of a parallelogram is 11cm and its height is 4cm. How many square centimeters is the area of a triangle with the same height as its bottom?
- 18. The sum of the two right angles of an isosceles triangle is 18. What is the area? jiefen
- 19. Two cylinders of equal height, one with a base area of 25 square centimeters and a volume of 100 square centimeters, and the other with a base area of 30 square centimeters What's its volume?
- 20. The area of an isosceles triangle with a waist length of 20 cm is 140 square cm. Take any point at the bottom, The length of the vertical line from this point to the two waists is a cm and B cm respectively?