Question

В в равнобедренном треугольнике периметр равен 21 см а боковая сторона равна шесть найдите длину основания

Answer 1

P = 21 см
a = b = 6 см
c-?

P = a+b+c
c = P - a - b
c = 21 - 6 - 6 = 9 (см)
Ответ: 9 см

Answer 2

21-12=9-так как это равнорбедренный треугольник

Answer 3

Finding the Length of the Base in an Isosceles Triangle

To find the length of the base in an isosceles triangle, we need to use the given information that the perimeter is 21 cm and one of the sides (the equal sides) is 6 cm.

Let's denote the length of the base as x.

The perimeter of a triangle is the sum of the lengths of all its sides. In this case, we have two equal sides of length 6 cm and a base of length x. Therefore, we can write the equation:

6 + 6 + x = 21

Simplifying the equation, we have:

12 + x = 21

To find the value of x, we can subtract 12 from both sides of the equation:

x = 21 - 12

Simplifying further, we get:

x = 9

Therefore, the length of the base in the isosceles triangle is 9 cm.