求梯形面积的公式是什么?
梯形又称梯形,是一个封闭的四边形,它包含一对平行的边,而另一对边不平行。侧面的长度可能会变化,也可能不会变化。梯形的平行边称为梯形的底。底部之间的距离称为梯形的高度。梯形的高度也称为高度。梯形的不平行边称为腿。
梯形的内角和是360°。它有 4 条边和 4 个顶点。
梯形的性质
梯形具有以下一组特性:
- 梯形的底面彼此平行。
- 两条对角线彼此相等。
- 所有内角之和等于360 °
梯形面积
任何封闭图形的面积都是该对象所包围的空间。在梯形的情况下,面积由下式给出,
面积 = 1/2 × 平行边之和 × 它们之间的距离。
让我们假设 a 和 b 是梯形的平行边,h 是它们之间的距离。让梯形的面积用 A 表示。
我们有,
A = 1/2 × (a + b) × d
在简化方程时,我们有,
一个=
梯形的面积以平方单位表示。
梯形周长
通过添加所有边来找到梯形的周长。因此,梯形公式的周长为
梯形的周长,P = a + b+ c + d 个单位
在哪里,
“a, b, c, d”是梯形的边。
这个用于计算梯形面积的公式称为梯形公式。
示例问题
问题 1. 求平行边为 20 m 和 25 m 的梯形面积,其高为 20 m?
解决方案:
Here.
To find the area of the trapezium
As we know that
Area of trapezium = 1/2 × (Sum of parallel side) × Height
Area of trapezium = 1/2 × (a + b) × Height
Where ‘a’ and ‘b’ are parallel sides
Given:
a = 20 m
b = 25 m
Height = 20 m
Now,
Area of trapezium = 1/2 × (20 + 25) × 20
Area of trapezium = 1/2 × (45) × 20
Area of trapezium = 450 m2
Therefore,
The area of trapezium is 450 m2.
问题 2. 如果梯形的面积为 1600 cm 2 ,高为 40 cm,求梯形的平行边之和?
解决方案:
Here we have to find the sum of the parallel sides of the trapezium.
As we know that
Area of trapezium = 1/2 × (Sum of parallel side) × Height
Given:
Area of trapezium = 1600 cm2
Height = 40 cm
Area of trapezium = 1/2 × (Sum of parallel side) × Height
1600 = 1/2 × (Sum of parallel side) × 40
Sum of parallel sides = (1600 × 2)/40
Sum of parallel sides = 80 cm
Therefore,
The sum of the parallel sides of the trapezium is 80 cm.
问题 3. 如果梯形的周长为 110 m,边长为 20 m、25 m 和 30 m,计算梯形的缺失边?
解决方案:
Here,
We have to find the missing side of the trapezium.
As we know that
Perimeter of trapezium = Sum of all the sides
Assume the sides are a, b, c, and the missing side be d
Given :
a = 20 m
b = 25 m
c = 30 m
Perimeter of trapezium = a + b + c + d
110 = 20 + 25 + 30 + d
d = 110 – (20 + 25 + 30)
d = 110 – (75)
d = 35 m
Therefore,
The missing side of the trapezium is 35 m.
问题 4. 如果梯形的周长是 250 厘米,边是 40 厘米、60 厘米和 40 厘米,求等腰梯形缺少的边和面积?梯形的高度为 50 厘米。
解决方案:
Here,
We have to find the missing side of the trapezium.
As we know that
Perimeter of trapezium = Sum of all the sides
Assume the sides are p, q, r and the missing side be ‘s’
Given :
p = 40 cm
q = 60 cm
r = 40 cm
Perimeter of trapezium = p + q + r + s
250 = 40 + 60 + 40 + s
s = 250 – (40 + 60 + 40)
s = 250 – (140)
s = 110 cm
Therefore,
The missing side of the trapezium is 110 cm.
Now,
Finding the area of the trapezium
As the perimeter is isosceles, so the nonequal side are parallel side
Parallel sides are
q = 60
s = 110
As we know that
Area of trapezium = 1/2 × (Sum of parallel side) × Height
Given :
Height = 50 cm
Area of trapezium = 1/2 × (60 + 110) × 50
Area of trapezium = 1/2 × (170) × 50
Area of trapezium = 4250 cm2.