Subject: Mathematics
Book: Maths Mastery
The area of a circle is given by the formula A = πr², where r is the radius—the distance from the center to the circumference. If you have a circle with radius 5 cm, its area is π × 5² = 25π cm². In practical terms, you might need to measure the space a circular rug covers or the cross-sectional area of a circular pipe. Knowing how to apply A = πr² is foundational in geometry, engineering, and architecture. Pairing this knowledge with circumference or volume formulas further expands your capability to handle circular shapes in diverse projects and daily scenarios.
What is the length of the diagonal of a square with a side length of 7 cm?
View QuestionThe base of a triangle is 10 cm and its height is 6 cm. What is its area?
View QuestionIf a person can type 45 words per minute, how many words can they type in 2 hours?
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 square root of 121?
View QuestionWhat is the area of a sector of a circle with radius 14 cm and central angle 90°?
View QuestionA number is increased by 20% and then decreased by 10%. What is the net change?
View QuestionWhat is the slope of a line passing through the points (2, 3) and (4, 7)?
View QuestionWhat is the probability of drawing a king from a standard deck of 52 playing cards?
View QuestionA square is inscribed in a circle with a radius of 5 cm. What is the area of the square?
View Question