x 0.77 x 0.77 x 4 = R. 7.4506 ver. car

. Quatre fois le carsé du rayon = 6.16 + 3.1416 = 1.96 ; le rayon

= (1.96 + 4) = R. 0.70 torse,

. 9.25 + 3.1416 = R. 2.94 verges.

3.1416 x 0.983 = lère R. 3.0171, surf. intérieure; 3.1416 x 1.053 = 2e R. 3.4636 ver. car.

PROBIÈME XVI,— EXEROIOES (p. 314).

. 5 x 0.65 = R. 3.25 ver. carrées.

+ 3.1416 x 2.10 x 2 x 0.8 = R, 10.5657 ver. car. + 3.1416 x 3.50 x 2 x 1.25 = R. 27.4890 ver. car.

2.85 + 0.45 = 6.33 ver. = la circonférence d'un grand cercle ; 6.33 + (3.1416 x 2) = 1.007 ver. = le rayon de la sphère ; 3.1416 x 1.0073 x 4 = R, 12.742 ver. car.

8.1416 x 3965.82936 x 2 x 327.15657 = R, 8131563.9095235 milles carrés,

PROBLÈME XVII, — ExER0oIOES (p. 315).

55.44 + (3.1416 x 4) = 2.10 ver. = le rayon; 4.1888 x 2.105 = R. 38.792476 ver. cubes.

4,1888 x 0.845 = R, 2.482718 ver. cub.

4.62 + (3.1416 x 2) = 0.736 ver, = le rayon ; 4.1888 x 0.736569 = R, 1.663227 ver. cub.

V (6.16 + 3.1416) = 1.40 ver, = le rayon; 4.1888 x 1.45 R. 11.494067 ver. oub,

nféur ;

ercle ; hêre ;