That it must be a right angle triangle because the 3rd angle must be 90 degrees
The longest side is twice as long as the shortest side.
That it has a 90 degree angle and two equal 45 degree angles
false
An obtuse triangle has 1 obtuse angle and 2 acute angles which add up to 180 degrees.
true
The exterior angles of a triangle add up to 360 degrees.
no
false
That it must be a right angle triangle because the 3rd angle must be 90 degrees
false
You have to extend the line opposite to the 2 angles For example, if u have a triangle ABC, and if BC is the base, then if u produce BC, the exterior angle formed will be equal to angle A + angle B OR if u produce CB then the exterior angle will be equal to angleA+ angle C This is true about all the sides(not only the base side) I just gave the base as an example
The longest side is twice as long as the shortest side.
true
true
true
That it has a 90 degree angle and two equal 45 degree angles