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.
What is the area of a sector of a circle with radius 14 cm and central angle 90°?
View QuestionIf the angles of a triangle are in the ratio 2:3:4, what is the measure of the largest angle?
View QuestionThe sum of the reciprocals of two numbers is 1/4. If one number is 12, what is the other?
View QuestionThe base of a triangle is 10 cm and its height is 6 cm. What is its area?
View QuestionA car covers a distance of 150 km in 2.5 hours. What is its average speed?
View QuestionA sum of money triples itself in 12 years at simple interest. What is the rate of interest per annum?
View QuestionWhat is the probability of drawing a king from a standard deck of 52 playing cards?
View QuestionIf a:b = 5:7 and b:c = 6:11, what is a:c?
View QuestionWhat is the probability of drawing an ace from a standard deck of 52 cards?
View QuestionIf a = 5 and b = 12, what is the length of the hypotenuse of a right triangle?
View Question