Question

Найдите площадь треугольника со сторонами 12см 16см 21см

Answer 1

Решение :
1) 12*16=192(см)
2) 192*21=4.032(см)
Ну и ответ)

Answer 2

Finding the Area of a Triangle

To find the area of a triangle, we can use Heron's formula, which states that the area of a triangle with sides of lengths a, b, and c is given by:

Area = sqrt(s(s-a)(s-b)(s-c))

where s is the semi-perimeter of the triangle, calculated as:

s = (a + b + c) / 2

In this case, the sides of the triangle are given as 12 cm, 16 cm, and 21 cm. Let's calculate the area using Heron's formula.

Calculation

First, we calculate the semi-perimeter s:

s = (12 + 16 + 21) / 2 = 49 / 2 = 24.5 cm

Next, we substitute the values of a, b, c, and s into the formula:

Area = sqrt(24.5(24.5-12)(24.5-16)(24.5-21))

Simplifying further:

Area = sqrt(24.5 * 12.5 * 8.5 * 3.5) = sqrt(24.5 * 12.5 * 8.5 * 3.5) cm^2

Using a calculator, we find that the area is approximately 98.5 cm^2.

Answer

Therefore, the area of the triangle with side lengths 12 cm, 16 cm, and 21 cm is approximately 98.5 cm^2.