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It is: 180-angles 1 and 2 = angle 3

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Q: How do you find the 3rd angle in a triangle?
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What is the measurement of the 3rd angle for a triangle given both angle measurement 54 degrees?

It is an isosceles triangle and the 3rd angle is 72 degrees.


How do you find the third interior angle of a triangle?

Add the first two angles together and subtract the total from 180 to find the 3rd angle


How do you use the altitude to find the length of a right angle?

If 2 sides are known then use Pythagoras' theorem to find the 3rd side of a right angle triangle.


What type of triangle has an angle that measures 60 and an angle that measures 90?

It is a right angle triangle and the 3rd angle will measure 30 degrees


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It is a right angle triangle because the 3rd angle has to be 90 degrees


What type of triangle has an angle that measures 20 degrees and an angle that measures ninety degrees?

It is a right angle triangle and its 3rd angle is 70 degrees.


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If it's a right angle triangle then use Pythagoras' theorem to find the 3rd side


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It is a right angle triangle because the 3rd angle is 90 degrees


What must true statement about a 30 angle and 60 angle triangle?

That it must be a right angle triangle because the 3rd angle must be 90 degrees


What type of triangle has an angle measures 60 degrees and an angle that measures 90 degrees?

It is a right angle triangle and the 3rd angle will measure 30 degrees


If ABC is a right triangle if AC6 and CB9 what is AB?

Use Pythagoras' theorem for a right angle triangle to find the length of the 3rd side.


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The 90 degree angle in a right angle triangle is opposite its hypotenuse.