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" A circle may be regarded as composed of an infinite number of triangles, the sum of whose bases is the circumference of the circle and whose altitude is the radius of the circle. "
Graded Work in Arithmetic - Σελίδα 52
των Samuel Wesley Baird - 1901
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New Franklin Arithmetic, Βιβλίο 2

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...faces is 19£ ft. at the base and 51£ ft. high. CIRCLES. 318. A circle may be considered as made up of triangles the sum of whose bases is the circumference of the circle and whose height is the radius. Hence the area of a circle equals the product of the circum- ' ference...

Complete Graded Arithmetic: Third grade-[eighth grade], Τόμος 8

George Edward Atwood - 1902
...can be drawn on a board 14 inches square ? AREA OF A CIRCLE A circle may be regarded as composed of a large number of triangles, the sum of whose bases is the circumference of the circle, and whose altitude is the radius. The area of a circle is equal to the product of the circumference and...

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...in diameter. How many revolutions does it make in going a mile? 452. To find the area of a Circle. A circle may be regarded as composed of a very large number of triangles, the sum of whose bases forms the circumference of the circle, and whose altitude is the radius of the circle. Hence, RULE....

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John William McClymonds, David Rhys Jones - 1907 - 324 σελίδες
...in. ; 1 mi. ; 36 rd. 281. Area of a Circle. 1. A circle may be regarded as composed of an infinite number of triangles, the sum of whose bases is the circumference of the circle and whose altitude is the radius of the circle. Therefore the area of a circle is the area of the triangles...

Walton and Holmes's Arithmetics: 1st Book-, Βιβλίο 4

George Augustus Walton, Stanley Harry Holmes - 1909
...or ird, or 2 irr is the formula for finding any circumference. A circle may be considered as made up of triangles the sum of whose bases is the circumference of the circle and whose height is the radius. Since the circumference = 2 ,trr, the area of a circle = 2 Trr x -, or...

Walton and Holmes's Arithmetics: 1st Book-, Βιβλίο 4

George Augustus Walton, Stanley Harry Holmes - 1909
...ir</, or 2 ir/ 1 is the formula for finding any circumference. A circle may be considered as made up of triangles the sum of whose bases is the circumference of the circle and whose height is the radius. Since the circumference = 2 irr, the area of a circle = 2 irr x -, or tir...

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John William McClymonds, David Rhys Jones - 1910 - 324 σελίδες
...in. ; 1 mi. ; 36 rd. 281. Area of a Circle, 1. A circle may be regarded as composed of an infinite number of triangles, the sum of whose bases is the circumference of the circle and whose altitude is the radius of the circle. Therefore the area of a circle is the area of the triangles...




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