[中一]兩條estimation 求解

圖片參考：http://imgcld.yimg.com/8/n/HA00860292/o/701108060041813873438190.jpg

1:The height and the radius of the base of a cylindrical glass container are 8cm and 5cm respectively. It is known that the formula for the volume of cylinder is V=兀r^2h,where V is the volume of the cylinder, r is the radius of the base and h is the height of the cylinder.(take兀=3.14)
(a) Estimate the h of water inside the container.


(b)Estimate the volume of water inside the container, correct to the nearest cm^3


圖片參考：http://imgcld.yimg.com/8/n/HA00860292/o/701108060041813873438201.jpg

2:The above figure shows a box in the shape of a cuboid.David puts 12 CDs into the box and finds out that the thickness of the CDs is exactly 10cm

(a) Calculate the thickness of 1 CD.correct to the nearest 0.1cm.


(b) Estimate the number of CDs that the box can hold

(c)Estimate the volume of the spaces indside the box,correct to the nearest cm^3