The area of an isosceles triangle is equal to 5 square centimeters. What is the area of the circle

The area of an isosceles triangle is equal to 5 square centimeters. What is the area of the circle

Suppose that the opposite side of the vertex angle of an isosceles triangle is equal to the diameter of a circle, then the area of an isosceles triangle = R 2, and the area of a circle = π R 2 = 5 π cm 2

A circle, there is a triangle, known area of the circle area
A right triangle, the area is 12 square centimeters, find the area of the circle
Is a right triangle placed in a corner of the circle, in addition to the bottom of the two sides are the radius of the length of the circle
Quick. It's an additional 30 points

Let the radius of the circle be x, then 0.5 * x * x = 12 x * x = 24, and the area of the circle is π * x * x = π * 24 = 24 π

Draw the largest triangle in a circle. Given that the area of the circle is 28.26 square centimeters, what is the area of the triangle?
No equation solution, formula calculation, explanation,)

Radius of circle = 28.26/3.14, root = 3cm
The largest triangle is an equilateral triangle, and its center of gravity is the center of the circle. The line between a vertex and the center of gravity of the triangle extends to the opposite side of the vertex (in an equilateral triangle, the line between the vertex and the center of gravity is equal to two-thirds of the corresponding height of the vertex). This line is the height of the equilateral triangle = 4.5cm, the bottom edge = 2 * [(3 ^ 2-1.5 ^ 2) root] = 3 * root 3, So the area of a triangle is about 11.475 square centimeters

Question: a triangle (in a circle) area of 5 square centimeters, find the area of the circle

5*2*3.14=31.4