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Because the 3 interior angles of any triangle always add up to 180 degrees.

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Q: Why is a isoscele angle tri180 degrees?
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Related questions

Can a isoscele triangle also be a right triangle?

Yes. If it has a 90deg angle and 2 45 deg angles it will be.


Who was isoscele?

The uncle of Scalene


Is an isoscele a quadrilateral and a regular?

Yes


What is 90 angle degrees?

A right angle is an angle of 90 degrees.


What kind of angle is 175 degrees?

An angle of 175 degrees is an obtuse angle


If an angle is obtuse then it has a measure of 120 degrees?

When an angle has a measure of 120 degrees, it is an obtuse angle. When an angle is an obtuse angle its measure is between 90 and 180 degrees. That is: 90 degrees < obtuse angle < 180 degrees.


What is the opposite of a acute angle?

No such thing as opposite of acute angle. An ACUTE angle is an angle of less than 90 degrees. A RIGHT angle is an angle of 90 degrees only. An OBTUSE angle is an angle between 90 degrees and 180 dehrees. An angle of 180 degrees is a straight line. A REFLEX angle is an angle between 180 degrees and 360 degrees.


What is the supplement of the complement of a 38 degrees angle?

The supplement of an angle is the angle that, when added to the original angle, equals 180 degrees. The complement of an angle is the angle that, when added to the original angle, equals 90 degrees. Therefore, the supplement of the complement of a 38-degree angle would be the angle that, when added to the complement of 38 degrees (52 degrees), equals 180 degrees. This angle would be 128 degrees.


What is a angle that is 142 degree angle?

An angle that measures 142 degrees is classified as an obtuse angle. In geometry, an obtuse angle is an angle that is greater than 90 degrees but less than 180 degrees. It falls between a right angle (90 degrees) and a straight angle (180 degrees).


Which angle equal 1.00 degrees?

There is no angle that represents 100 degrees but an angle that is 100 degrees is an obtuse angle.


Which has a greater measure an angle complementary to an angle measuring 58 degrees or an angle supplementary to an angle measuring 125 degrees?

It is the supplementary angle of 125 degrees which is 55 degrees


What kind of angle measures 193 degrees?

The angle that 193 degrees is an octuse angle. 90 degrees is a right angle.