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The sum of the other angles totals up to 90°.
what are the properties of an isosceles triangle? all angles in a triangle add up to 180
isosceles means two sides are equal right?
so lets see if we can draw a right triangle with both legs that look about equal
|dw:1439920586813:dw| here is my attempt
yes those are equl i think
ok now it is clear that if the two legs are equal, the two angles are equal as well?
and it is also true that the total degrees in a triangle with be 180 you have already used up 90 in the right angle, which means both of those equal angles together must add up to 90 degrees
so what is half of 90?
ok so we have completed finding all the angles of that right isosceles|dw:1439920814239:dw| triangle
\[\color\magenta\heartsuit\] ready to move on?
you want to draw an equilateral triangle?
nice one again the sum of the measure of the angles is 180 and since all the sides are the same, all the angles are also the same so what is one third of 180?
so they are all equal 60 right
Can an equilateral triangle ever be a right triangle too? Explain your answer. NO since all the angles are 60, none are 90!!
last part only
you want to draw some right triangle?
ok that looks good
Can an equilateral triangle ever be a right triangle too? Explain your answer. no, since "obtuse" means bigger than 90 you have already used up 90 in the right angle, so you only have 90 left for the other two angles
therefore each must be less than 90
so it would have to be 45
who deleted my post
no they could be anything but their total has to be less than 90
|dw:1440022658129:dw| sorry im bad at drawing