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Are rhombus and parallelogram axisymmetric?
Rhombus is, parallelogram is not, parallelogram is centrosymmetric figure
In parallelogram, rectangle, rhombus, square, these four kinds of figures, that is, axisymmetric figure, and central symmetry figure How many?
Parallel rectangle; quadrilateral; symmetrical figure, also central symmetry figure, square is axis
Cut 2 cm from the bottom of a right angle trapezoid to form a square
Area of trapezoid = 8x8 + 8x2 / 2
=64 + 8 = 72 (square centimeter)
How to find the area of square rectangle trapezoid triangle isosceles triangle trapezoid?
Square: side length times side length
Rectangle: length multiplied by width
Trapezoid: (top bottom + bottom) multiply by height and divide by two
Triangle: base times height divided by two
Isosceles triangle: base times height divided by two
Isosceles trapezoid: (bottom + bottom) times height and divide by two
A trapezoid is composed of two squares and an isosceles triangle. The side length of the square is 4,8 cm. What is the area of trapezoid ABCD?
fifty-seven point six
24 * 4.8 divided by 2
A trapezoid, if the upper bottom increases by 4 cm and the bottom decreases by 4 cm, it becomes a square with an edge length of 8 cm, and the trapezoid area is () square cm
If the upper bottom increases by 4cm and the bottom decreases by 4cm, it becomes a square with 8cm side length, which indicates that the upper bottom is 4, the lower bottom is 12, the height is 8, and the area is (4 + 12) × 8 △ 2 = 64
The bottom of a right angled trapezoid is 8 cm. If you increase the bottom by 3 cm, it will become a square. What is the area of the trapezoid Draw a triangle with the largest area in a rectangle. The area of the triangle is equal to that of the rectangle A parallelogram and a triangle have the same base and height. Their area sum is 45 square meters. What is the area of the parallelogram and what is the area of the triangle
(8 + (8-3)) * 8 / 2 = 52 (square centimeter)
half
30 square meters
15 square meters
An isosceles triangle and two squares of the same size can form a right angle trapezoid. Given that the side length of the square is 3 decimeters, find the area of the trapezoid An isosceles triangle and two squares of the same size can be assembled into a right angle trapezoid. The side length of the square is known to be 3 decimeters, and the area of the trapezoid is calculated
Hello, landlord
As shown in the figure
In the first case, s = (6 + 9) x3 △ 2 = 22.5
In the second case, s = (3 + 9) X6 △ 2 = 36
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Two isosceles triangles and a square form a trapezoid (as shown in the figure). If the top and bottom of the trapezoid are 5cm, the area is square ; if Make this trapezoid into a square, and the length of the rectangle is 10 cm, Width centimeter. The figure on the right shows a cube with edge length of 2 decimeters, and its surface area is square decimeter. Three of them The surface area of the cube is square decimeter.
Two isosceles triangles and a square form a trapezoid (as shown in the figure). If the top and bottom of the trapezoid is 5cm, the trapezoid height = 5cm, the trapezoid bottom = 5 + 5 + 5 = 15cm, the trapezoid area = (upper bottom + bottom) × height △ 2 = (5 + 15) × 5 △ 2 = 50 square centimeter. If the trapezoid is changed into a rectangle, two isosceles are needed
As shown in the figure, subtract a small square with side length B from the square with side length a, which is greater than B. the remaining part is fried into an extra trapezoid, and the areas of the shadow parts of the two figures are calculated respectively
a²-b²=(a+b)(a-b)
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- 4. The top angle of an isosceles triangle is 43 degrees. What is its base angle?
- 5. For an isosceles triangle with a vertex angle of 30 degrees, if the waist length is 2, then the height () on the waist is () and the area of the triangle is ()
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- 7. The degree of the top angle of an isosceles triangle is four times that of the base angle. How many degrees are the base angle and the top angle of the isosceles triangle? What triangle is this?
- 8. In the triangle ABC, ab = AC, the line passing through a vertex intersects the opposite side of D. the line divides the original triangle into two isosceles triangles In the triangle ABC, ab = AC, the line passing through a vertex intersects the opposite side of D. the line divides the original triangle into two isosceles triangles. Find the degree of the three inner angles of the triangle ABC.
- 9. The isosceles triangle ABC with base BC is still isosceles triangle after being divided into two smaller triangles by a line passing through a vertex Draw all the situations and mark the angles
- 10. The area and perimeter of an congruent triangle are equal. Are the two triangles with the same area and perimeter congruent triangles?
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- 12. In △ ABC, ab = AC, if a straight line passes through one of the vertices, divide △ ABC into two isosceles triangles, and calculate the internal angle degrees of △ ABC Write three different solutions
- 13. Draw a triangle in the square below. Both isosceles and obtuse angles are required
- 14. For an isosceles triangle, the degree of one of its angles is four times that of the top angle, and the top angle of this isosceles triangle is () degrees
- 15. The ratio of the top angle to the base angle of an isosceles triangle is 4:1. What are the degrees of the three angles of this isosceles triangle?
- 16. For an isosceles triangle, the degree of an angle is five fifths of the sum of its internal angles. What are the three internal angles of this triangle? Come on, hurry up
- 17. The degree of the base angle of an isosceles triangle is 1 of the top angle 2. What is the top angle of this triangle?
- 18. The ratio of a vertex angle to a base angle of an isosceles triangle is 5:2. How many degrees are its top angle and base angle?
- 19. If the length of the generatrix of a cone is 20cm, and the angle between the generatrix and the circumference = axis is 30 °, then the radius of the bottom surface?
- 20. As shown in the figure, it is known that in isosceles △ ABC, the vertex angle ∠ a = 36 ° and BD is the bisector of ∠ ABC The value of AC is equal to () A. 1 Two B. 5−1 Two C. 1 D. 5+1 Two