Final answer:
The correct answer falls under the subject of Mathematics, specifically geometry, as it involves concepts such as the area of triangles, Pythagorean theorem, and properties of geometric shapes like equilateral triangles and polyhedra.
Step-by-step explanation:
The correct answer is option 'Mathematics'. The question references various concepts such as the area of a triangle, point charges in an equilateral triangle, the Pythagorean theorem, pie chart divisions, and trigonometry related to triangles and polyhedra.
These concepts are fundamental topics in geometry, which is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space.
Whether it is establishing the relationship between the sides of a right triangle or understanding the properties of an equilateral triangle, all of these relate to mathematical principles and problem-solving techniques.
When we talk about the Pythagorean theorem, we are typically referring to the relationship A = √(9² +5²) = 10.3, which links the lengths of the sides of a right triangle.
Meanwhile, points such as an icosahedron having 20 equilateral triangle faces are associated with geometric shapes and volumes, further solidifying that the subject of the question is mathematics.
The correct answer is option Mathematics. In geometry, isosceles and equilateral triangles are topics covered in high school mathematics.
An isosceles triangle is a triangle that has two sides of equal length, and an equilateral triangle is a triangle that has all three sides of equal length. These triangles have specific properties and formulas that can be used to find the measures of their angles and sides.