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On a drawing whose scale is one thousandth of a thousand, the area of a square is sixteen square centimeters. What is its actual area
Its actual area is 1600 square meters. 1; the actual area of 1 cm in 1000 drawings is 10 meters, and the actual area of 1 cm is 100 meters, which means that the actual area is 1600 square meters
A rectangle is drawn on a drawing with a scale of 1:1000, the length is 10 cm, the width is 6 cm, and the actual area is 6000 square cm
What's the length and width on a 1:2000 scale drawing?
Length: 10 * 1000 / 2000 = 5cm
Width: 6 * 1000 / 2000 = 3cm
If each side of a square grassland is increased by 5 meters, it will still be a square grassland after expansion, and the area is 425 square meters more than the original square grassland
The original side length of the square is (425-5 × 5) △ 2 △ 5, = (425-25) △ 10, = 400 △ 10, = 40 (m). Answer: the original side length of the square grass is 40 m
If each side of a square grassland is increased by 5 meters, it will still be a square after expansion, with an area of 425 square more than the original square;
Find the side length of the original square grass? Find the formula!
425 △ 5 = 85m
85-5 = 80m
80 △ 2 = 40m
It turns out that the side length of the square grass is 40 meters
A rectangular grassland is 25 meters long. If the length is reduced by 5 meters, the shape of the remaining part will become a square. How many square meters is the original area of this grassland? (draw a picture and answer again.)
As shown in the figure: 25 × (25-5) = 25 × 20 = 500 square meters; a: the original area of this grassland is 500 square meters
The width of a rectangular grassland is 20 meters. If you increase its width by 5 meters, it will become a square. How many square meters is the original area of this grassland?
(20 + 5) × 20 = 500 (M2)
It is known that BD is a middle line of triangle ABC. If the circumference of abd and BCD are 24 and 17, then the length of ab-bc is____ .
The length of ab-bc is equal to the circumference of abd minus the circumference of BCD, and the result is 7
Triangle ABC and BD are a middle line of triangle ABC. The perimeter of triangle BCD is 9. If AB = 5 and BC = 3, what is the perimeter of triangle abd?
BD is a middle line of triangle ABC
AD=CD
The perimeter of the triangle BCD is 9
CD+BD+BC=9,CD+BD=9-3=6
The perimeter of triangle abd = AD + BD + AB = 6 + 5 = 11
It is known that the ratio of the three median lines of a triangle is 3:5:6, and the perimeter of the triangle is 112 cm
Let the lengths of the three median lines of a triangle be 3x, 5x and 6x respectively
3x + 5x + 6x = 112 △ 2, that is, x = 4
∴3x=12,5x=20,6x=24
The length of the three median lines are: 12cm; 20cm; 24cm
The length of three sides of a triangle is 2.5cm, 4cm and 3cm respectively; the length of three sides of another triangle is 3.2cm, 2.4cm and 2cm respectively
Are the two triangles similar? Why?
Don't answer because the three sides of these two triangles are proportional, I know they are - but which side and which side tell me
2.5:3.2 is not equal to 4:2.4
2.5/2=3/2.4=4/3.2=1.25
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