Mensuration for elementary and middle class schools1875 - 85 σελίδες |
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Σελίδα 14
... figure , they make four angles of 90 degrees . Every angle which con- tains 90 ° is a right angle ; half of a right angle ( BOF ) is an angle of 45 ° , and a third of one ( EOD ) is an angle of 30 ° . The right angle is so called ...
... figure , they make four angles of 90 degrees . Every angle which con- tains 90 ° is a right angle ; half of a right angle ( BOF ) is an angle of 45 ° , and a third of one ( EOD ) is an angle of 30 ° . The right angle is so called ...
Σελίδα 16
... figure , i.e. , made up of right lines or straight lines . It is called a triangle because it has three angles , or ( which is exactly the same thing ) three sides . In the same way four - sided figures , of which we shall speak a ...
... figure , i.e. , made up of right lines or straight lines . It is called a triangle because it has three angles , or ( which is exactly the same thing ) three sides . In the same way four - sided figures , of which we shall speak a ...
Σελίδα 19
... figures previously mentioned , and called quadrangles ; they are both contained by four straight lines , and all the angles in each are right angles ; but in the square all the sides are equal ( A ) , while in the rectangle only the ...
... figures previously mentioned , and called quadrangles ; they are both contained by four straight lines , and all the angles in each are right angles ; but in the square all the sides are equal ( A ) , while in the rectangle only the ...
Σελίδα 20
... figure , let us suppose that instead of d a B A having given the length of AB , BC ( which , for shortness , we will call respectively c and a , from the letters placed at the opposite angles ) , we have given only a and d . Now the ...
... figure , let us suppose that instead of d a B A having given the length of AB , BC ( which , for shortness , we will call respectively c and a , from the letters placed at the opposite angles ) , we have given only a and d . Now the ...
Σελίδα 21
... figures which differ from the square and rectangle in one respect , viz . , that their angles are not right angles . They are , indeed , like squares and rectangles that have been forcibly wrenched ( like a loose slate - frame ) , from ...
... figures which differ from the square and rectangle in one respect , viz . , that their angles are not right angles . They are , indeed , like squares and rectangles that have been forcibly wrenched ( like a loose slate - frame ) , from ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
16 Maps acres ATLAS base breadth calculating called centre chains circle circular circumference cloth lettered consisting of 32 contains exactly convex surface cube cubic foot cubic ft diagonal diameter dimensions divided ellipse Euclid EXERCISES Fcap feet field find its area find its solidity find its volume find the area find the cost find the length Find the solid find the volume frustrum GEOGRAPHY Glasgow Gunter's chain heptagon Herriot Hill hypothenuse inscribed LESSON LL.D miles multiply half number of sides ordinates parallel parallelopiped pentagonal perpendicular distance perpendicular height Physical Map pickets poles radius rectangular regular polygon rhomboid rhombus right angle right-angled triangle rule sector segment side measures slant height small faces solid content solid figure sphere is equal square and rectangle square foot square pyramid square yard straight line surveyor trapezium trapezoid triangular prism vertex wedge World-shewing
Δημοφιλή αποσπάσματα
Σελίδα 10 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Σελίδα 29 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Σελίδα 23 - RULE. From half the sum of the three sides, subtract each side separately; multiply the half sum and the three remainders together, and the square root of the product will be the area required.