Page 2: Geometric Theorems and Volume Formulas
This page focuses on important geometric theorems and volume calculations, essential topics for the sujet brevet trigonométrie. It begins with the Pythagorean theorem and its converse, crucial for solving problems in right-angled triangles.
The Thales theorem is presented next, along with its reciprocal. This theorem is fundamental in géométrie and is often used in similarity and proportion problems.
Highlight: The Thales theorem states that if a line is drawn parallel to one side of a triangle, it divides the other two sides in the same ratio.
Trigonometry is introduced with the mnemonic "CAH SOH TOA," which helps students remember the relationships between sine, cosine, tangent, and the sides of a right-angled triangle.
Vocabulary: In trigonometry, "Adjacent" refers to the side next to the angle in question, while "Opposite" is the side across from it.
The page then provides formules mathématiques collège PDF for calculating perimeters and areas of various shapes, including squares, rectangles, and triangles. These formulas are essential for solving geometry problems in the Brevet exam.
The final section covers volume calculations for three-dimensional shapes. It includes formulas for prisms, cylinders, pyramids, cones, and spheres.
Example: The volume of a cylinder is calculated using V = π × R² × h, where R is the radius of the base and h is the height.
This comprehensive collection of formules maths 3ème brevet provides students with a valuable resource for tackling a wide range of mathematical problems in their exams.