If the sides of a triangle are 9cm,11cm and 15cm ,the angle opposite the largest side will be (1) Acute angle (2) Right angle (3) Obtuse angle (4) Straight angle

If one side of a triangle is double the other, and the angles on opposite sides differ by 60^0, then the triangle is equilateral (b) obtuse angled (c) right angled (d) acute angled

If the sides of a triangle are 3 cm, 4 cm and 6 cm long, determine whether the triangle is right-angled triangle.

If the sides of a triangle are 3 cm, 4 cm and 6 cm long, determine whether the triangle is a right-angle triangle.

The sides of a tringle are 8 cm, 10 cm and 12 cm. Prove that the greatest angle is double of the smalest angle.

The lengths of two sides of a triangle are 50 inches and 63 inches. The angle opposite the 63-inch side is 66^(@) . How many degrees are in largest angle of the triangle ?

If the sides of a right angled triangle are in A.P then the sines of the acute angles are

Prove that in a triangle, other than an equilateral triangle, angle opposite the longest side is greater than 2/3 of a right angle.

If the lengths of the sides of a triangle are 3, 5, 7 , then its largest angle of the triangle is

If the angles of a triangle are 30^(@) and 45^(@) , and the included side is (sqrt3 + 1) cm, then

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