An equilateral triangle has an altitude of 15 m. what is the perimeter of the triangle?

we know that

In the equilateral triangle every sides and angles are equal 

so

the measure of internal angles is equal to degrees 

see the attached picture to better understand the problem

In the right triangle ABC

where

BC is the altitude (opposite side angle degrees

AB is the hypotenuse

Clear AB

Perimeter of the triangle is equal to

but remember that

so

therefore

the answer is

there would only be 50 odd numbers between 1 and 100 so therefor there would be 50 even so that would only be 50 odd numbers.