### Фй лЭне пй чсЮуфет -Уэнфбоз ксйфйкЮт

Ден енфпрЯубме ксйфйкЭт уфйт ухнЮиейт фпрпиеуЯет.

### Ресйечьменб

 PART 5 PROBLEMS 48 PROPORTION 121
 MAXIMA AND MINIMA 135 Arithmetical Questions 161

### ДзмпцйлЮ брпурЬумбфб

УелЯдб 93 - If a straight line be divided into any two parts, the square on the whole line is equal to the squares on the two parts, together with twice the rectangle contained by the parts.
УелЯдб 100 - Three times the sum of the squares on the sides of a triangle is equal to four times the sum of the squares of the lines joining the middle point of each side with the opposite angles.
УелЯдб 54 - To prove that the exterior angle of a triangle is equal to the sum of the two interior opposite angles (see fig.
УелЯдб 40 - Thus, of all straight lines drawn from a given point to a given straight line, that which is perpendicular to the given line is a minimum.
УелЯдб 80 - To construct a circle which shall pass through two given points and touch a given straight line.
УелЯдб 91 - Two triangles are equal when they have two sides and the included angle of the one, respectively equal to two sides and the included angle of the other.
УелЯдб 161 - A field in the form of a right-angled triangle is to be divided between two persons, by a fence made from the right angle meeting the hypothenuse perpendicularly, at the distance of 880 links from one end ; required the area of each person's share, the length of the division-fence being 660 links. Ans. 2a. 3r.
УелЯдб 9 - If from any point within a triangle, two straight lines be drawn to the extremities of either side, their sum will be less than Hie sum of the two other sides of the triangle.
УелЯдб 30 - Any line drawn through the point of intersection of the diagonals of a parallelogram divides it into two equal quadrilaterals.
УелЯдб 46 - Ft, and to Dd. 23. The common intersection of the three lines divides each into two parts, one of which is double of the other, and this point is the vertex of three triangles which have lines drawn from it to the bisection of the bases. Apply Euc. n. 12, 13. 24. Apply Theorem 3, p.