Subject: Mathematics
Book: Maths Mastery
The total surface area of a sphere, often used for planetary or ball measurements, is given by 4πr², where r is the sphere’s radius. For example, if a sphere has a radius of 6 cm, its surface area is 4π × 6² = 144π cm². This calculation is instrumental in many scientific and engineering fields (e.g., heat transfer, atmospheric analysis) and everyday contexts like manufacturing spherical tanks or sports equipment. Familiarity with this formula complements the sphere volume formula to provide a full understanding of spherical geometry.
If x:y = 4:5 and y:z = 2:3, what is x:z?
View QuestionA number is increased by 20% and then decreased by 20%. What is the net change?
View QuestionIf a:b = 5:7 and b:c = 6:11, what is a:c?
View QuestionWhat is the probability of drawing a king from a standard deck of 52 playing cards?
View QuestionIf 2x - 3 = 7, what is the value of x?
View QuestionWhat is the sum of the interior angles of a hexagon?
View QuestionIf the perimeter of a square is 40 cm, what is the area of the square?
View QuestionIf a+b = 10 and ab = 21, what is the value of (a-b)^2?
View QuestionThe LCM of two numbers is 60, and their HCF is 5. If one of the numbers is 20, what is the other number?
View QuestionIf the probability of an event is 1/4, what is the probability of its complement?
View Question