If in a triangle ABC, a=3, b=5 and c=7, show that the triangle is obtuse angled.

The lengths of the sides of a triangle are 3, 5 and 7. Show that the triangle is obtuse-angled.

In /_\ABC , if a = 3. b = 5 and c =7, show that the triangle is obtused.

In /_\ABC , a=2 , b=3 , c=4 , prove that the triangle is obtuse angled.

If the sides of a triangle are 3, 5, and 6, prove that the triangle is obtuse - angled triangle and find the obtuse angle.

If the sides of a triangle are 3,5, and 6, prove that the triangle is obbtuse - angled triangle and find the obtuse angle.

In the triangle ABC, if cos 3 A + cos 3B+ cos 3C=1 , show that the triangle is obtuse-angled.

If A, B, C are the angles of a triangle ABC and if cosA=(sinB)/(2sinC) , show that the triangle is isosceles.

In a triangle ABC, the sides are 6cm, 10 cm and 14 cm. Show that the triangle is obtuse-angled with the obtuse angle equal to 120^@ .