If  then what is the value of cosec θ?

The two equal sides of an isosceles triangle is 20 cm each and the third side is 30 cm. What is the area (in cm²) of the triangle?

• 

• 100 cm²

• 

• 175 cm²

PQ is the chord of a circle whose centre is O. ROS is a line segment originating from a point R on the circle that intersect PQ produced at point S such that QS = OR. If 

• 30°

• 45°

• 60°

• 90°

74.

What is the value of tan 6°. tan 36°. tan 84°. tan 54°. tan 45°?

• 

• 

• 1

• 

If (x - 2)² + (y + 3)² + (z - 15)² = 0, then what is the value of x + y + z - 5?

• 5

• 9

• 15

• 20