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As there are two sides equal in an isosceles triangle,they both have two add up to

90 degree.One is 45 degree while the other one is 45 degree too.So as it has a right angle,it has one angle as 90 degree.45+45=90+90=180.So the sum of an right angled isosceles triangle is 180 degree.

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Anonymous

4y ago
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Q: What is the angle sum of an isosceles triangle?
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