Here is the formula to find the number of diagonals in a polygon. We can calculate the number of diagonals if we have the number of sides of a polygon. The formula only works for regular polygons.  

The life cycle of the Star/Sun starts from nebulae (consisting of gas and dust). All stars start from a cluster of gas and dust but as gravity pulls all the gas and dust, a protostar will start to form. Protostar The stage where clusters of gas and dust gather.

Concave and Convex Ray Diagram Understand the concept of a ray diagram in a convex and concave lens. By being able to draw the ray diagram, students can understand the characteristics of the ray. The position of the object will tell whether the image formed (Real/ Virtual, Inverter/Upright and.