Plane Geometry

help me solve this problem please...

Pennsylvania Railroad found it necessary, owing to land slide upon the road bed, to reduce the angle of inclination of the bank of a certain railway cut near Pittsburgh, from an original angle of 45 to a new angle 30.the bank as it originally stood was 200 ft long and had a slant length of 60 ft. find the amount of the earth removed, if the top level of the bank remained unchanged..?
--kindly show the solution. thank you!

how can I ask for answers here?

Two cylinders of equal radius have their axes meeting at right angles. Find the radius of the cylinders if the volume of the common portion is 144 cu.cm.

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1.)The chord of a circle is 1.25m long and is located at a distance of 0.65m from the center of the circle. Find the area?

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(please try to solve this so i can compare mine,tnx.)

HOW TO:
derive the formula of a ZONE of a SPHERE???

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(Please help me with these questions)

Solid Mensuration
by: Kern and bland
page 85

#15 Question
a block similar to the one considered in prob.3 (page 83) has a volume of 2000 cu.ft. find its altitude?

#16 Question
the space occupied by the water in a reservoir is the frustum of a right circular cone. each axial section of this frustum has an area of 8800 sq.ft. and the diameter of the lower and upper bases are in ratio 6:5. if the reservoir contains 13,600,00 gal. find the dept the water?

solid mensuration by Kern and bland
page 85

#13
Question: in the solid shown in page 84,edge AB is perpendicular to the base BDC and AEF. find the volume of the solid if BD is parallel to AE.?

page 85 #14
Question: the earth remove from a trench 8ft. deep 14ft. wide at the top and 10ft. wide at the bottom is thrown along side the trench so as to form a bank sloping on each sides at the angle to the horizontal. if the height of bank is three-fourth the width of its base. find the height of the bank.