This video tutorial covers the calculation of the area and circumference of a circle, focusing on sectors and arcs. It explains how to determine the area of a sector and the length of an arc using specific formulas. The tutorial includes practice problems and advanced exercises, such as calculating the perimeter of a sector and solving for unknown variables. The video aims to enhance understanding of geometric concepts related to circles.

What is the fraction of the circle's area used to calculate the area of a sector with a 70° angle?

• 70/45

• 70/360

• 70/180

• 70/90

Which symbol is commonly used to represent an angle in the formula for the area of a sector?

• Theta

• Alpha

• Gamma

• Beta

How do you calculate the arc length of a sector with an 87° angle and a diameter of 6 cm?

• 87/45 * Pi * 6

• 87/360 * Pi * 6

• 87/180 * Pi * 6

• 87/90 * Pi * 6

Which formula is used to calculate the circumference of a full circle?

• Pi * diameter

• 2 * Pi * diameter

• 2 * Pi * radius

• Pi * radius

What is the general formula for the area of a sector?

• Theta/90 * Pi * r^2

• Theta/180 * Pi * r^2

• Theta/360 * Pi * r^2

• Theta/45 * Pi * r^2

How do you calculate the arc length of a sector in terms of Pi?

• Theta/360 * Pi * diameter

• Theta/180 * Pi * diameter

• Theta/90 * Pi * diameter

• Theta/45 * Pi * diameter

What is the perimeter of a sector with a radius of 30 cm and an arc length of 27.75 cm?

• 87.8 cm

• 60 cm

• 90 cm

• 57.75 cm

How do you express the area of a sector with a 120° angle and a radius of 9 cm in terms of Pi?

• 18 Pi

• 27 Pi

• 36 Pi

• 45 Pi

If the arc length of a sector is 3.5 cm and the diameter is 8 cm, what is the angle of the sector?

• 50.1°

• 45°

• 60°

• 30°

What is the radius of a sector if its area is 66 cm² and the angle is 136°?

• 7.5 cm

• 8 cm

• 9 cm

• 6.5 cm