9 10 from the cinema to the library, from the supermarket to the cinema 420 meters, how many meters or how many meters?

The school and the cinema are on the same side, 1200-360 = 840m, not on the same side, 1200+360 = 1560m.

For example:

According to Pythagorean theorem:

775^2 + 688^2 = X^2

X^2=600625 + 473344

X^2= 1073969.

X =1036.3m.

Answer: The longest distance is about1036.3m..

definition

Addition: the operation of combining two numbers into one number.

Subtraction: when two addends and one of them are known, the operation of finding the other addend.

Multiplication: the operation of finding the product of two numbers.

(1) Multiplying a number with an integer is a simple operation, and you can find the sum of several identical addends.

(2) Multiply a number by a decimal to find a few tenths, a few percent and a few thousandths of this number.

(3) A number multiplied by a fraction is a fraction of this number.

Division: the operation of finding another factor by knowing the product of two factors and one of them.