Area of Parts of Circles and Shaded areas Mastery Check

Front

What is the formula for the area of a circle?

Back

The area A of a circle is given by the formula A = πr², where r is the radius of the circle.

Front

How do you calculate the area of a semicircle?

Back

The area of a semicircle is half the area of a full circle, calculated as A = (1/2)πr².

Front

What is the relationship between diameter and radius?

Back

The diameter d of a circle is twice the radius r, expressed as d = 2r.

Front

How do you find the area of a shaded region between two circles?

Back

To find the area of a shaded region between two circles, subtract the area of the smaller circle from the area of the larger circle: A = πR² - πr².

Front

What is the formula for the area of a rectangle?

Back

The area A of a rectangle is calculated as A = length × width.

Front

How do you calculate the area of a quarter circle?

Back

The area of a quarter circle is one-fourth of the area of a full circle, calculated as A = (1/4)πr².

Front

What is the formula for the area of a square?

Back

The area A of a square is given by the formula A = side², where 'side' is the length of one side of the square.

Front

How do you find the area of a frame surrounding a circular photo?

Back

To find the area of the frame, calculate the area of the larger circle (outer edge of the frame) and subtract the area of the smaller circle (the photo): A_frame = A_outer - A_inner.

Front

What is the approximate value of π (pi)?

Back

The approximate value of π (pi) is 3.14.

Front

How do you round a number to the nearest hundredth?

Back

To round a number to the nearest hundredth, look at the third decimal place. If it is 5 or greater, round up the second decimal place by one; if it is less than 5, keep the second decimal place the same.