Measure it with a protractor.
you just have to measure it in inches all the sidesAnother Answer:-Area of a triangle = 0.5*base*height
its useful if you work as a architect
state if the three numbers can be measures of the sides of a triangle. show your work 1- 15,12,9
the other 2 angles are 45 each... its a 90, 45, 45 triangle
isosceles,equilateral,rightangled
I quote " The square on the hypotenuse of a rightangled triangle..."
Right Triangle A rightangled triangle, since the last angle has to be 90 degrees
a right angled triangle with the remaining angles both being 45 degrees will be a rightangled triangle and an isosceles triangle.
One is 90 degrees, the other two can be any combination that adds up to 90.
First of all, it is clear that a right angled triangle does conform to Pythagoras. So, take any rightangled triangle, and without changing the length of the small sides, slightly reduce the right-angle to something smaller. What was the hypotenuse is now smaller than it was, so its square is now smaller. But the sum of the squares of the other 2 sides hasn't changed. So the Pythagoras result does not work for this new situation.
A triangle that is in a sequence
When a triangle is not a right triangle
The way you can work out the length of a triangle is if you are given the height and the area of that triangle ( this works of you don't want to measure it) or you could just measure it.
Pythagoras theorem will always work with a right-angled triangle.
It depends on what else you know about the triangle.
it depens if the isosceles triangle is a right triangle or not