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The base of an isosceles triangle is 15 cm, the waist is a cm and the height is h cm
Perimeter a + A + 15 = 2A + 15cm
Is the height on the bottom?
Area = 15h / 2 cm2
(1) An isosceles triangle has a circumference of 60cm, one of which has a waist length of 18cm. How many centimeters is the bottom length? (2) In a triangle, the degree of one angle is 3 times of the minimum angle, and the degree of the other angle is 6 times of the minimum angle. How many degrees are the three angles?
1. 60-18-18 = 24 cm
2. The minimum angle: 180 × (1 + 3 + 6) = 18 degrees, one angle 18x3 = 54 degrees, the other angle 18x6 = 108 degrees
X is the circumference of the triangle______ .
According to the trilateral relation of triangle, x + x > 20
2，
X > 5,
And ∵ x + x < 20,
∴x＜10，
So, 5 < x < 10
So the answer is: 5 < x < 10
Given that the circumference of an isosceles triangle is 20, what is the range of waist length x?
If the waist length is x, the base is 20-2x
According to the third side of 2x-20 >
If 20-2x is the third side of the triangle, then 20-2x > 0 (2)
From (1), x > 5
From (2), x < 10
So 5 x 10
If the circumference of an isosceles triangle is 20, the waist is x, and the base is y, then the range of Y is Is the value range of the bottom
Y is less than 10 and greater than 0
It doesn't seem so simple
I'll think about it a little longer
It should be
The circumference of an isosceles triangle is 30 cm. If the base is 12 cm long, what is its waist length
（30-12）/2=9
The waist length is nine centimeters
Isosceles triangle has a circumference of 12 cm, a base length of Y cm and a waist length of x cm. Then the relationship between Y and X is y=______ （3＜x＜6）．
∵2x+y=12
∴y=-2x+12
∵x＞6÷2=3，y＜2x
∴3＜x＜6
In other words, the functional relationship between waist length y and base x is: y = - 2x + 12 (3 < x < 6)
The middle line on the waist of an isosceles triangle divides the circumference of the triangle into 12 cm and 9 cm. Find the sides of the isosceles triangle
8,8,5
6,6,9
Let the waist be x and the base y
1.x>y
2x+y=9+12
x-y=3
x=8 y=5
2.x
The circumference of an isosceles triangle is 18. If the waist length is y and the base length is x, then the relationship between X and y can you find the value range?
x+2y=18
The relation between X and Y is y = - 1 / 2 x + 9
（1）x+y>y
（2)2y>x
(3) |x-y|is 0
Homework help users 2017-10-14
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The waist length of the isosceles triangle with Girth 18 is x and the base length is y. The functional relationship between Y and X and the value range of X are obtained
2x+y=18
∴y=-2x+18
﹛x＞0
y＞0 -2x+18＞0 2x＜18 x＜9
2x＞y 2x＞-2x+18 4x＞18 x＞4.5
The value range of X is 4.5 < x < 9
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