1. A polygon that has 3 sides is called a Triangle. 2. In the octal system, the numbers are represented through digits lower than the base. 3. If two straight lines have two points in common, then they are equal. 4. The cosine of an angle between 0° and 90° will be a value between 0 and 1. 5. The volume is the measure of the space included between the external surfaces of a three-dimensional figure. 6. The angle subtended from the arc that measures 1/360 of the circle circumference is called a degree. 7. The correct conversion factor, in the SI, for the litre is 1L = 1 dm3. 8. The number 192 is a multiple of 24. 9. The first equivalence principle of the equations states that adding to both equation members the same number or the same equation (that contains one unknown), we obtain an equation equivalent to the one given. 10. (a+b)^2 = (a)^2 + 2ab + (b)^2. 11. To each elementary function of trigonometry it is possible to associate an inverse function only for some angles. 12. It is defined logarithm in base ''a'' of ''b'' as that real number ''c'' that satisfies this equality $$a^c = b$$. 13. The square of a real number is always greater than or equal to 0. 14. A polar system of coordinates is based on one angle and one radius. 15. The volume of a cube with side length l=10cm is 1 dm^3. 16. The fraction 15/4 can be defined as improper. 17. The equation $$X^3 - 3X = 3$$ is a third degree equation. 18. The area of a trapezoid with bases b1=10m, b2=5m and height h=2m is calculated by $$A = \frac{(b_1 + b_2)}{2} \times h = \frac{(10 + 5)}{2} \times 2 = 15 m^2$$ (Note: none of the options match this correct calculation, so no correct answer here). 19. The product of algebraic fractions gives as result a fraction that has for numerator the algebraic product of numerators and for denominator the product of denominators. 20. Given x=1 and y=9, the expression $$xy^2 = 81$$ is correct. 21. When the direction of the projection is angled in relation to the plane, it is called oblique projection. 22. The arctangent function is the inverse of the tangent function. 23. The cubic root of 64 is 4. 24. The Cartesian plane is divided into four areas called quadrants, represented through Roman numbers I, II, III, IV, in counterclockwise direction. 25. A straight line has no start and no end (both are true). 26. The power of power is a power that has for base the same base and for exponent the product of exponents. 27. The purpose of a graph in geometry is to reproduce a real object (three-dimensional) in a two-dimensional environment without the loss of important geometrical information. 28. The trigonometric relationships allow resolving a right triangle if we know two sides and the angle included between them or two angles and a side (both options are correct). 29. The pie chart is usually called a circle chart. 30. Through two points passes only one straight line. 31. If two straight lines lie on the same plane but have no common point, then they are parallel. 32. The straight line, as a geometric object, is a particular type of line that never changes its direction.