The anlges of a triangle are in ratio 3 : 5 : 7. The triangle is
(a) Acute angled
(b) Obtuse angled
(c) Right angled
(d) An isosceles triangle
If for a △ABC,cotA. cotB. cotC>0 then the triangle is
In In ΔABC, if 8R2=a2+b2+c2, then the triangle is
In a ΔABC,if∠C=30∘,a=47cm and b=94cm, then the triangle is
In a triangle ABC, if tanA+tan+B+tanC=6 and tanAtanB=2, then the triangle is