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" The area of a triangle is equal to one-half the product of its base and altitude. "
Observational Geometry - Page 180
by William Taylor Campbell - 1899 - 240 pages
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A Treatise on Special Or Elementary Geometry, Volumes 1-2

Edward Olney - Geometry - 1872 - 562 pages
...parallelogram is equivalent to a rectangle of the same base and altitude (313). 323. COB. 3. — The area of a triangle is equal to one-half the product of its base and altitude; fora triangle is one-half of a parallelogram of the same base and altitude (3 14). 324. COB. 4. —...
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A Treatise on Special Or Elementary Geometry

Edward Olney - Geometry - 1872 - 472 pages
...parallelogram is equivalent to a rectangle of the same base and altitude (313). 323. COR. 3. — The area of a triangle is equal to one.half the product of its base and altitude ; for a triangle is one.half of a parallelogram of the same base and altitude (3 14). 32Ф. COR. 4....
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National Arithmetic, Oral and Written: For Common and Graded Schools ...

Joseph Ficklin - Arithmetic - 1881 - 406 pages
...altitude 6 ft. 9 x fi SOLUTION. — — = 27 ; hence, the area is 27 sq. ft. a EXPLANATION. — The area of a triangle is equal to one-half the product of its base and altitude. FORMULA : Area of triangle = \ (Base x Altitude). 2. What is the area of a triangle whose base is 50...
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Elementary Geometry: Including Plane, Solid, and Spherical Geometry, with ...

Edward Olney - Geometry - 1883 - 352 pages
...parallelogram is equivalent to a rectangle of the same base and altitude (332). 347. COROLLARY 3.—The area of a tri-angle is equal to one-half the product of its base and altitude; for a triangle is one-half of a parallelogram of the same base and altitude (333). 348. COROLLARY 4.—Parallelograms...
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Essentials of Geometry

Alfred Hix Welsh - Geometry - 1883 - 326 pages
...stones, of rectangular form, 2 ft. 3 in. by 10 in., will be required to pave it? THEOREM VI. • The area of a triangle is equal to one-half the product of its base by its altitude. r- Let ABD be any triangle; then 7 will ABD = $ a b. ^/ For, draw DC parallel to AB,...
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The Elements of Geometry

Webster Wells - Geometry - 1886 - 392 pages
...and their bases equal to b and 6' respectively. Then, area ABCD = area ABD + area BCD. But since the area of a triangle is equal to one-half the product of its base by its altitude (§ 327), area ABD = \ ax 6, and urea. BCD = la xb'. Therefore, area ABCD =Jax6+Jax6'...
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Elements of Analytic Geometry

George Albert Wentworth - Geometry, Analytic - 1887 - 264 pages
...are the points (2, 1), (3, - 2), (- 4, - 1). A ns. 10. It is shown in Elementary Geometry that the area of a triangle is equal to one-half the product of its base and its altitude ; hence this problem may be solved by performing the following operations : (i.) Find...
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Chauvenet's Treatise on Elementary Geometry

William Chauvenet - Geometry - 1887 - 342 pages
...AD and DC respectively, the rectangle OD will be equivalent to one-half the rectangle ABCD. 6. The area of a triangle is equal to one-half the product of its perimeter by the radius of the inscribed circle. 7. The area of a rhombus is one-half the product of...
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Chauvenet's Treatise on Elementary Geometry

William Chauvenet, William Elwood Byerly - Geometry - 1887 - 331 pages
...AD and DC respectively, the rectangle OD will be equivalent to one-half the rectangle ABCD. 6. The area of a triangle is equal to one-half the product of its perimeter by the radius of the inscribed circle. 8. The straight line joining the middle points of...
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Annual Report of the Board of Education and the Superintendent of Public ...

New Jersey. State Board of Education - Education - 1888 - 692 pages
...3. Prove that the sum of the angles of any triangle is equal to two right angles. 4. Prove that the area of a triangle is equal to one-half the product of its base and altitude. 5. Prove that the side of a regular inscribed hexagon is equal to the radius of the circle. rods up...
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