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If one side of the isosceles triangle is 7cm long and the other side is 15cm long, the circumference of the isosceles triangle is______ ．
There are two situations: when the waist is 7, 7 + 7 < 15, so it can not form a triangle; when the waist is 15, 15 + 7 > 15, so it can form a triangle, the circumference is: 7 + 15 + 15 = 37cm
The two sides of an isosceles triangle are 3cm and 7cm in length
Because it is an isosceles triangle, the two sides should be equal, and because the two sides are 7 and 3 respectively, the three sides should be: 3,3,7; 7,7,3, and the largest side of the three sides of the triangle should be smaller than the other two sides. Because 7 is less than 3 + 3, 3 cannot be the third side
If you don't understand, ask me again
Questioner's questioning 2010-06-30 21:17
Can a triangle be formed as long as the sum of two sides is greater than the sum of one side?
Then this problem should be that one side is 6, one side is 6, one side is 5, so it can be an isosceles triangle /?
Supplement by the respondent 2010-06-30 21:18
Sorry, the largest one of the three sides of a triangle is smaller than the sum of the other two sides
Questioner's questioning 2010-06-30 21:24
Because: 3 + 3 = 6
6＜7
The sum of two sides in a triangle is greater than the third
Questioner's questioning 2010-06-30 21:10
Can a triangle be formed as long as the sum of two sides is greater than the sum of one side?
So this problem should be that one side is 6, one side is 6, one side is 5, so it can be an isosceles triangle?
Supplement of the team 2010-06-30 21:16
Yes: the sum of the two sides must be greater than the third side; the difference between the two sides must be less than the third side
Sorry, the largest one of the three sides of a triangle is smaller than the sum of the other two sides
The lengths of two sides of a triangle are 3cm and 7cm respectively, and the third side is the integer ACM, and satisfies a-square-10a + 21 = 0
Analysis:
From "a ^ 2-10a + 21 = 0", we can get a = 3 or 7,
In addition, the sum of any two sides of a triangle must be greater than the third side, so a = 3, rounding off (3 + 3)
The length of the bottom of an isosceles triangle is 7cm. The middle line of a waist divides its circumference into two parts, and the difference is 3cm. The length of a waist of a triangle can be calculated
In the isosceles triangle ABC, ab= AC.BC 7 cm,
Point D is the midpoint of AC, ad = DC = 1 / 2Ac
The perimeter of the triangle abd is ab + BD + ad
The perimeter of triangle CBD is CB + BD + CD
If the perimeter of the triangle abd is 3cm larger than that of the triangle CBD
AB+BD+AD=CB+BD+CD+3
The length of waist AB is 10 cm
If the perimeter of the triangle abd is 3cm smaller than that of the triangle CBD
AB+BD+AD=CB+BD+CD-3
The length of waist AB is 4cm
If the two sides of an isosceles triangle are 6cm and 2cm long, its perimeter is______ cm．
The two sides of an isosceles triangle are 6cm and 2cm in length, which can be divided into two cases: ① 6 is the bottom, 2 is the waist, 2 + 2 < 6, which should be omitted; ② 2 is the bottom, 6 is the waist, then its perimeter is 2 + 6 + 6 = 14cm
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