# Plane Trigonometry

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### مقاطع مشهورة

الصفحة 36 - ... the three angles of a triangle are together equal to two right angles, although it is not known to all.
الصفحة 17 - Radian is the angle subtended, at the centre of a circle, by an arc equal in length to the radius...
الصفحة 44 - A person standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is 50°; walking 40 ft.
الصفحة 13 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sidef.
الصفحة 1 - Every circumference of a. circle, whether the circle be large or small, is supposed to be divided into 360 equal parts called degrees. Each degree is divided into 60 equal parts called minutes, and each minute into 60 equal parts called seconds.
الصفحة 10 - If the radius of the earth be 4000 miles, what is the length of its circumference?
الصفحة 42 - From the top of a cliff 150 ft. high the angles of depression of the top and bottom of a tower are 30° and 60°, respectively.
الصفحة 220 - A ladder placed at an angle of 75° just reaches the sill of a window at a height of 27 feet above the ground on one side of a street. On turning the ladder over without moving its foot, it is found that when it rests against a wall on the other side of the street it is at an angle of 15° with the ground.
الصفحة 215 - From the top of a hill the angles of depression of two objects situated in the...