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Σελίδα 31 - Find the radii r, r' of the inscribed and circumscribed spheres, the surface S, and the volume V. 9. The same exercise for the regular octahedron. 11. The same exercise for the regular tetrahedron. 12. The same exercise for the regular octahedron. 13. The height of a frustum of a right cone is h, and the radii of its bases r, r' ; what is the volume of the largest regular four-sided frustum which can be made from it? 14. The volume of a right cone, whose slant height is equal to the diameter of its...
Σελίδα 8 - A pyramid 15 ft. high has a base containing 169 sq. ft. At what distance from the vertex must a plane be passed parallel to the base so that the section may contain 100 sq.
Σελίδα 62 - In any triangle, the product of two sides is equal to the square of the bisector of the included angle plus the product of the segments of the third side. Hyp. In A abc, the bisector t divides c into the segments, p and q. To prove ab = t
Σελίδα xiv - The straight line joining the middle points of two sides of a triangle is parallel to the third side, and equal to half of it.
Σελίδα 7 - The sum of the diagonals of a quadrilateral is less than the sum and greater than half the sum of tht. sides. * 21. Each side of a triangle is less than half the perimeter.
Σελίδα 62 - In every inscribed quadrilateral the product of the diagonals is equal to the sum of the products of the opposite sides.
Σελίδα xxvi - Theorem. The perimeters of two regular polygons of the same number of sides have the same ratio as their radii, or as their apothems.
Σελίδα 67 - Every straight line cutting the sides of a triangle (produced when necessary) determines upon the sides six segments, such that the product of three non-consecutive segments is equal to the product of the other three.
Σελίδα 83 - OP= 4 inches, r = 4 inches. 16. To find the locus of points from which two given circles will be seen under equal angles. Show that the distances from any point in the locus to the centres of the two circles are as the radii of the circles; this reduces the problem to Ex. 12. 17. To find the locus of the points from which a given straight line is seen under a given angle. 18. To find the locus of the vertex of a triangle, having given the. base and the ratio of the other two sides. 19. To find the...