Which cities were India's first steel project-

Find the area of the largest triangle made in a semicircle of r cm radius?

Triangle PQR is inscribed in the circle whose radius is 14 cm . If PQ is the diameter of the circle and PR =10 cm , then what is the area of the triangle ? 

ABCD is a rhombus whose one angle is 60°.Find the ratio of the lengths of its diagonal?

ABCD is a trapezium in which AB is parallel to CD and AB = 4 ( CD ) . The diagonals of the trapezium intersects at O. what is the ratio of area of triangle DCO to the area of the triangle ABO ?

In a polygon, the sum of the interior angles is double the sum of the exterior angles. What is the number of sides of the polygon?

If one angle is half of its complementary angle, find that angle.

O is the orthocentre of ΔABC. If ∠BOC=110°, ∠BAC is equal to