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Kerala (English Medium)->Std 9 Questions

Total Questions 530
in a polygon,two angles are 150 degree each and others are 105 degree each,find the no of sides.(please do it step-by step otherwise i can't understand)
AB,BC,CD are three consecutive sides of a regular polygon.if angle BAC=20degree find the measure of one exterior.find the no of sides.(please do it step-by step otherwise i can't understand)
One angle of a heptagon is 126 degree and each of the other six angles is x degree.find x.(please do it step-by step otherwise i can't understand)
the exterior angle of a regular polygon is one fifth of its interior angles.find the no of sides of the polygon(please do it step-by step otherwise i can't understand)
a polygon has 27 diagonals.how many sides does the polygon have?(please do it step by step otherwise i can't understand)
PQRST is a regular pentagon.prove that PR and PS trisects angle QPT?
The interior angle of a regular polygon is double that of the exterior angle,find the measures of each?
how can we cancel numbers in math?how can we cancel numbers in equation and divisions also show me the situations that we can't cancel numbers?
what is a chord?
how do we cancel number?ex 360(a1+a2)=360(b1+b2)=a1+a2=b1+b2. here the 360 cancelled.how do this happen and tell me how to cancel numbers
what is reflected ray ?
describe the words/
what is a chord?
describe about angles of a quadrilateral
describe about corresponding angles
WHAT IS ATMOSPHERE POLUTION
WHAT IS GLOBAL WARMING
WHAT IS TRESSTRAIL RADIATION?
HOW THE DUST PARTICLES REACH ATMOSPHERE?
WHAT IS AEROSLS?