Subject: Mathematics
Book: Maths Mastery
A semicircle is half a circle, but its perimeter (also called its “circumference” boundary) includes the diameter and half the circle’s circumference. The formula is P = πr + 2r if using r for the radius, or P = (πd / 2) + d if using d for the diameter. For instance, a semicircle with radius 5 has perimeter π × 5 + 2 × 5 = 5π + 10. This knowledge helps in designing curved edges for arcs, gates, or semicircular frames. Understanding partial circle perimeters extends to advanced shapes and real-world designs with circular segments.
What is the area of a sector of a circle with radius 14 cm and central angle 90°?
View QuestionWhat is the value of x if 3x + 7 = 16?
View QuestionThe sum of the squares of two consecutive integers is 145. What are the integers?
View QuestionIf the sum of the squares of two consecutive positive integers is 365, what are the integers?
View QuestionThe sides of a triangle are 13 cm, 14 cm, and 15 cm. What is its area?
View QuestionIf a+b = 10 and ab = 21, what is the value of a^3 + b^3?
View QuestionIf the length of a rectangle is doubled and the width is halved, what is the change in area?
View QuestionWhat is the probability of drawing an ace from a standard deck of 52 cards?
View QuestionIf 8x = 512, what is the value of x?
View QuestionIf the perimeter of a square is 36 cm, what is the length of its diagonal?
View Question