Find the number of seconds in a year, and the fractional error in assuming that 1yr=π×107 sec

There are seconds in a year.

The fractional error in assuming    is .

Step-by-step explanation:

Assuming a year of 365 days (non leap-years), we can found how many seconds are in a year by multiplying seconds in a minute, minutes in an hour, hours in a day and finally days in a year.

Knowing how many seconds are in a year, we can find the absolute error of the estimation by taking the module of the difference between real value and estimation:

Now that we know the absolute error, we calculate the fractional error by dividing it by the real value:

That is a minimal error, close to 0,4% and enough for every day estimations.

20

step-by-step explanation:

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc