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@mathstudent55 @Chelsealee @superman36
Let's work through them. Equilateral triangle: all sides (and angles) are equal Acute triangle: all angles less than 90 degrees Right triangle: 1 angle is exactly 90 degrees Isosceles triangle: two equal sides (and angles) Obtuse triangle: one angle greater than 90 degrees
that may help
Ok, thanks guys
My guess is that it's A.
Am I correct?
yes u r correct! :)
Ok, I posted this question cause I wasn't sure if it was C or A
^an acute triangle
well, it is cute, too :-) but as you have drawn it, it is actually obtuse, top angle slightly larger than 90 degrees
@ggcola Did you find the correct answer?
Sorry I had to go somewhere to help my mom..so if A is wrong is it C? @mathstudent55
@ggcola I offered to work through them with you... As mathstudent55 showed, it is possible to make an acute triangle which is not an equilateral triangle. That rules out A We know that the sum of the interior angles of a triangle is 180 degrees, so it is not possible to have an obtuse triangle with a right angle, as those two angles alone would total more than 180 degrees. That rules out D You can make a right triangle with angles 30, 60 and 90 degrees. That is proof that not all right triangles are isosceles triangles. That rules out B. That leaves us with answer choice C: all equilateral triangles are also acute triangles. Well, if we have 3 equal angles and they total 180 degrees, each angle must be 1/3 of 180 degrees, or 60 degrees. 60 degrees is less than 90 degrees, so a triangle with 3 such angles is an acute triangle (all angles less than 90 degrees). Therefore, answer choice C is correct.