 | Thomas Tate (mathematical master.) - 1848 - 284 páginas
...SB — therefore by Art. 51. Geo., cota; 2a2 COt2P + COt2B — 2 C0t2o' 18. At the top of a tower a feet high, the angles of depression of the top and bottom of an upright column, standing on the same level plane as the tower, were found to be 30° and 60° ;... | |
 | John William Colenso (bp. of Natal.) - 1851 - 148 páginas
...foot of the rock, having given L tan 18° = 9.51 17760, log 1.5388 = .1871940. (See Art. 155.) 8. At the top of a tower, 108 feet high, the angles of depression of the top and bottom of an upright column, standing on the same horizontal plane with the tower, were found to be 30° and... | |
 | Thomas Stantial - 1859 - 352 páginas
...After sailing NW for 5 miles, A bore due E., and B due NE Find the distance between A and B. 14. At the top of a tower 108 feet high, -the angles of depression...another tower (standing on the same horizontal plane) were found to be 30° and 60° ; find its height. SECTION V— CONIC SECTIONS. 1. GIVE the definition... | |
 | Sandhurst roy. military coll - 1859 - 672 páginas
...300 = sec45° + tan 45°' (2.) tan 2A - tan A= - nl. cos A + cos 3A (3.) From the top of a tower 150 feet high, the angles of depression of the top and bottom of a vertical column standing on the same horizontal plane were observed to be 22° 15' and 46° 30' ;... | |
 | Samuel H. Winter - 1864 - 348 páginas
...angles and a side of a plane triangle ; show how to solve the triangle. 8. From the top of a tower 150 feet high, the angles of depression of the top and bottom of a vertical column, standing on the same horizontal plane, were observed 22° Iff and 44° 30': find... | |
 | James Robert Christie - 1866 - 428 páginas
...length : viz. 9T> 32' 10"; DAB = 53° 57' 20"; CBA = 32° 2' 10", and 809. From the top of a cliff 108 feet high, the angles of depression of the top and bottom of a cliff which forms the opposite bank of a river are observed to be 30° and 60° respectively ; find... | |
 | Sidney Luxton Loney - 1893 - 534 páginas
...that both of the required distances are equal to 236-6... feet. Ex. 3. From the top of a cliff, 200 feet high, the angles of depression of the top and bottom of a tower are observed to be 30° and 60° ; find the height of the tower. Let A be the point of observation... | |
 | Frank Castle - 1899 - 424 páginas
...base of 100 yards measured from its foot, is 30° ; find its height. 4. From the top of a tower 150 feet high the angles of depression of the top and bottom of a vertical column, standing on the same horizontal plane, were observed to be 22° 15' and 44 30';... | |
 | William Ernst Paterson - 1911 - 262 páginas
...angles of elevation to be 15° and 65° 30' at the same moment. Find the height of the balloon. 10. From the top of a tower, 108 feet high, the angles of depression of the top and bottom of a vertical column are found to be 30° and 60° respectively. What is the height of the column ? 11.... | |
 | 280 páginas
...that both of the required distances are equal to 236-6... feet. Ex. 3. From the top of a cliff, 200 feet high, the angles of depression of the top and bottom of a tower are observed to be 30° and 60° ; find the height of the tower. Let A be the point of observation,... | |
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At the top of a tower, 108 feet high, the angles of depression of the top and bottom of... 