In a triangle $ABC$, $\angle A$ is $25°$ more than $\angle B$; and $\angle C$ is $10°$ less than $\angle B$. What are the angles of the triangle?

The following triplet forms the length in $\mathrm{cm}$ of the sides of a triangle. Is this right-angled triangle?

$8,10, 6$

The following triplet forms the length in $\mathrm{cm}$ of the sides of a triangle. Is this right-angled triangle?

$15, 8, 9$

The following triplet forms the length in $\mathrm{cm}$ of the sides of a triangle. Is this right-angled triangle?

$9, 60, 61$

The following triplet forms the length in $\mathrm{cm}$ of the sides of a triangle. Is this right-angled triangle?

$16, 30, 34$