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 the perimeter of a square is 36 cm, what is the length of its diagonal?
View QuestionA car covers a distance of 150 km in 2.5 hours. What is its average speed?
View QuestionIf the radius of a circle is 7 cm, what is its circumference?
View QuestionA number is increased by 20% and then decreased by 20%. What is the net change?
View QuestionWhat is the sum of all odd numbers from 1 to 99?
View QuestionA man rows downstream at 6 km/h and upstream at 4 km/h. What is the speed of the stream?
View QuestionWhat is the area of a circle with a diameter of 14 cm?
View QuestionWhat is the greatest common divisor (GCD) of 36 and 48?
View QuestionIf x:y = 2:3 and z:y = 4:3, what is x:z?
View QuestionIf a+b = 10 and ab = 21, what is the value of a^3 + b^3?
View Question