The length of the trapezoid is 5, the length of the bottom is 10, and the length of the waist is 3 and 4 respectively A. 18 B. 22.5 C. 26.25 D. 30

The length of the trapezoid is 5, the length of the bottom is 10, and the length of the waist is 3 and 4 respectively A. 18 B. 22.5 C. 26.25 D. 30

In △ Dec, CE = 5, de = 3, CD = 4. According to the inverse theorem of the Pythagorean theorem, we can get the following results: 1) in △ Dec, we can get the following results: 1) in △ Dec, we can get the following conclusion: 1) according to the inverse theorem of Pythagorean theorem, we can get the following conclusion: 1) in △ Dec, the area of triangle is 90 ° and in △ Dec, the area of triangle is equal to 5

The length of the trapezoid is 5, the length of the bottom is 10, and the length of the waist is 3 and 4 respectively A. 18 B. 22.5 C. 26.25 D. 30

In △ Dec, CE = 5, de = 3, CD = 4. According to the inverse theorem of the Pythagorean theorem, we can get the following results: 1) in △ Dec, we can get the following results: 1) in △ Dec, we can get the following conclusion: 1) according to the inverse theorem of Pythagorean theorem, we can get the following conclusion: 1) in △ Dec, the area of triangle is 90 ° and in △ Dec, the area of triangle is equal to 5

The upper bottom of isosceles trapezoid is 4, the bottom length is 10, and the waist length is 5

If the height of a vertex over the top and bottom is made, it can be seen that the height, waist and bottom form a right triangle. If the length of the bottom edge of the triangle is (10-4) / 2 = 3, then the height length is 4 under the root sign (5 * 5-3 * 3) = 4
The area is 4 * (10 + 4) / 2 = 28

The sum of the bottom and bottom of a right angled trapezoid is 20cm. The length of the two waists is 6cm and 10cm respectively. What is the area of this trapezoid?

Area = 20 × 6 × 1 / 2 = 60 square centimeter

The length of the trapezoid is 5, the length of the bottom is 10, and the length of the waist is 3 and 4 respectively A. 18 B. 22.5 C. 26.25 D. 30

Through D, make de ∥ AB to BC to e, DH ⊥ BC to H,
∵AD∥BC，DE∥AB，
The quadrilateral abed is a parallelogram,
∴AD=BE=5，AB=DE=3，
∴CE=CB-BE=5，
In △ Dec, CE = 5, de = 3, CD = 4,
According to the inverse theorem of Pythagorean theorem, it is obtained that: ∠ EDC = 90 °,
In △ Dec, according to the area formula of triangle, we can get the following results:
One
2×5×DH=1
2×3×4，
The solution is: DH = 12
5，
S trapezoid ABCD = 1
2（AD+BC）•DH，
=1
2×（5+10）×12
5=18．
Therefore, a

If the upper bottom of isosceles trapezoid is known to be 8, the waist length is 10, and the lower bottom is 10 more than the upper bottom, then the trapezoid area is

Height of trapezoid = 10? - (10 / 2) 2 = 5 √ 3
Area = (10 + 8 + 8) * 5 √ 3 / 2 = 65 √ 3

The bottom of a right angled trapezoid is 6 decimeters long, and its bottom is 10.8 decimeters long. Its two waist lengths are 6 decimeters and 3.6 decimeters respectively. What is the area of this trapezoid?

∵ the vertical line between two parallel lines is the shortest
The height of the right trapezoid is 3.6 decimeters
ν area = (upper bottom + lower bottom) × height △ 2
　　=（6+10.8）×3.6÷2
= 30.24 square decimeter
A: the area of this trapezoid is 30.24 square decimeters

The upper bottom of an isosceles trapezoid is 2cm, and the bottom is 4cm. Its circumference is 12cm. How many centimeters is the waist of isosceles trapezoid?

12-2-4=6
6/2=3

The upper bottom of an isosceles trapezoid is 2cm, and the bottom is 4cm. Its circumference is 12cm. How many cm is the waist of isosceles trapezoid? It indicates that the two waist of isosceles trapezoid are equal

The waist of isosceles trapezoid = (12-2-4) △ 2 = 3 (CM)

The waist length of isosceles trapezoid is 12 cm, the upper bottom length is 15 cm, and the angle between the upper bottom and the waist is 120 degrees

An auxiliary line is made at the intersection of the waist and the upper bottom, which is perpendicular to the bottom,
The angle between the auxiliary line and the waist is 30 degrees, so the opposite side = 12 / 2 = 6cm
Bottom = bottom + 6 × 2 = 15 + 12 = 27
So the perimeter of trapezoid is 15 + 27 + 2 × 12 = 66cm