Mathematcis Chapter 9 Lesson 3/4

Question 1

What is the area of a circle?

Answer 1

It is the space inside the circle

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

Question 2

If the radius of a circle is 2 cm, what is the area?

Answer 2

A = 3.14 x 2 x 2 = 12.56 cm²

This calculation uses the formula A = πr².

Question 3

What is the diameter of a circle if the radius is 1 cm?

Answer 3

d = 2 cm

The diameter is twice the radius.

Question 4

If the diameter of a semicircle is 2 cm, what is its area?

Answer 4

A = 3.14 x 1 x 1 = 1.57 cm²

The area of a semicircle is calculated using A = (1/2)πr².

Question 5

Fill in the blank: The formula for the area of a semicircle is A = _______.

Answer 5

(1/2)πr²

Question 6

What is the area of a semicircle with a diameter of 2 cm?

Answer 6

A = 3.14 x 1 x 1 = 1.57 cm²

The radius is 1 cm since the diameter is 2 cm.

Question 7

If the radius of a circle is 2 cm, what is the area?

Answer 7

A = 3.14 x 2 x 2 = 12.56 cm²

This is the same calculation as for the full circle area.

Question 8

What is the value of π (pi) used in area calculations?

Answer 8

3.14