Which statements must be true?

select each correct answer.

mn∥su

om∥tu

on=12su

st=2on

no=nm

The correct options are  , and ST=2ON .

Explanation:

Since, In triangle STU,  M, O and N are mid points of line ST, SU and TU respectively.( given SM=MT, TN=NU and SO=OU)

By the mid point theorem which states that the line segment joining two midpoints of two sides of a triangle must be parallel to the third side of the given triangle. And, it is half of the third side.

Since MN is a line segment which is made by mid points M and N.

So, it must be parallel to the third side SU.

Therefore,

Similarly, OM is a line segment which is made after joining mid points O and M. So, it must be parallel to third side TU.

Now,ON is a line segment which is made after joining mid points O and N. So, it must be half of the third side ST.

Therefore, ON=ST/2⇒2ON=ST

Therefore, .

Note: ON=12SU (not necessary),  NO=NM(not necessary)

"it's not the heat, it's the humidity".   that's a partly valid phrase you may have heard in the summer, but it's actually both.   the heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature.   this has important considerations for the human body's comfort.   when the body gets too hot, it begins to perspire or sweat to cool itself off.   if the perspiration is not able to evaporate, the body cannot regulate its temperature.   evaporation is a cooling process.   when perspiration is evaporated off the body, it effectively reduces the body's temperature.   when the atmospheric moisture content (i.e. relative humidity) is high, the rate of perspiration from the body decreases.   in other words, the human body feels warmer in humid conditions.   the opposite is true when the relative humidity decreases because the rate of perspiration increases.   the body actually feels cooler in arid conditions.   there is direct relationship between the air temperature and relative humidity and the heat index, meaning as the air temperature and relative humidity increase (decrease), the heat index increases (decreases).

step-by-step explanation: