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If one angle of a triangle is equal to t...

If one angle of a triangle is equal to the sum of the other two, show that the triangle is a right triangle.

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let in a `/_\ABC`
`/_A=/_B+/_C`
from angle sum we have `/_A+/_B+/_C=180^@`
or,`/_A+/_A=180^@`(from above)
`/_A=90^@`
so it is a right triangle.
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