Cross section represents the intersection of an object with a plane. There are two types: horizontal (parallel) and vertical (perpendicular). Cross-sectional area is the projected area of a solid when cut by a plane
Centroid is the point where three medians of a triangle meet. Medians join vertex to midpoint of opposite side. Centroid divides medians into 2:1 ratio. Centroid always lies inside triangle. Also known as center of gravity or object's center
Centroid is the point where three medians of a triangle intersect. Medians are line segments from vertex to opposite side midpoint. Centroid is always located inside the triangle. Divides medians into 2:1 ratio by centroid
Perimeter is the total length of a triangle's boundary. Perimeter comes from Greek words 'peri' (around) and 'metron' (measure). All triangle sides must have same unit
Perimeter is the total distance around a triangle. Formula: P = a + b + c for any triangle. Example: 5 + 5 + 5 = 15 for equilateral triangle
Triangle area formula: A = 1/2bh. Height can be found by dividing base by 2, then dividing by area. Any side can be base, regardless of triangle drawing