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If an angle differs from its supplement ...

If an angle differs from its supplement by `10^@` , find the angle.

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Let angle`=x^@`
Its complement `=90 - x^@`
`x^@-(90-x^@)=10`
`x^@-90^@+x^@=10`
`2x^@=10+90=100`
`x^@=100^@/2= 50^@`
`therefore` Required angle`=50^@`
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