Chapter 1
Number and Quantity
Course: Core Academic Skills For Educators Combined Test 5752
Subject: Core Academic Skills Educators Mathematics 5733
Chapter: Geometry
Two-dimensional shapes are foundational in geometry. They consist of flat figures defined by points, line segments, and curves lying on a plane. These figures are not only important in pure mathematics but are also critical in fields such as construction, engineering, physics, architecture, and design. Understanding their properties allows one to calculate areas, perimeters, and other dimensions, and to apply these to real-world problems.
Properties of triangles
A triangle is a polygon with three sides and three angles.
- The sum of its interior angles is always 180°.
- The type of triangle depends on its side lengths and angles:
Equilateral: all three sides and angles are equal; each angle is 60°.
Isosceles: two sides equal, and the opposite angles equal.
Scalene: no equal sides, all angles different.