Book Review

Information
There are so many information that we can get by read and learn this book. Beside can increasing our knowledge of math (lesson), it also can increasing our knowledge of some concept of math in our real life. Some of the informtion are:
>In chapter I : When a part of sunshine is blocked by a certain object their will a shadow of the body compare our shadow and the tower shadow besides. By comparing our shadow and tower shadow we can measure the height of the shadow. We can use the concept of similarity to mesure.
>In chapter II : If the building has a circle form with the similar diameter on every floor, then the sides of the buildings should be inform of curve. If the tortuous sides of the building are to be layered by glasses, so that the area of needed glasses could be get by using the concept of three dimensional curved surfaces shape.
>In chapter III : Rain is one of the natural phenomena on the earth. The highest average of rain density canbe found in Cherrapunji, Bangladesh. The height of that region is 1.290 m above the sea level and average rain density is 1.270 cm so that it is called the wettest points on the earth. While the lowest average of rain density can be found in Atacama desert, Chili. It has 0,01 cm average of rain density so that it is called the driest point on the earth. Hence, the p robability of the rain in Atacama desert is very low ; moreover the area several place in Atacama desert that has never been rained 400 th for predicting the rain density we can use the concept of statistic and probability.
>In chapter IV : If someone jumps from a high with original velocity is zero, then it is called free fall movement. The relation between the velocity and height of the man from the ground is formulated by V = root(2gh)where V is the velocity, g is the gravitation at the place, and h is the height from the ground. The form root(2gh) is one of the example of roots that we can learn in chapter IV.
>In chapter V : When a ball fallen from a certain height on the flat ground, the ball will bounce back but with the lower height from its initial height. If the camparison between the ball height at this moment and the ball height before ots constant, so we can calculate the height of the ball from the time it was fallen until its stopped using the geometric series.