Geometry Quiz: Circles and Triangles

Find the area of a circle with a radius of $7$ cm. (Use $\pi = \frac{22}{7}$)

• 44 cm²

• 49 cm²

• 14 cm²

A circular garden has a diameter of $10$ m. What is its area? (Use $\pi = 3.14$)

• 314 m²

• 31.4 m²

• 25 m²

If the radius of a circle is doubled, how does the area change?

• It doubles

• It stays the same

• It becomes eight times larger

Find the area of a circle with a radius of $1$ unit.

• 1 square unit

• 2\pi square units

• \frac{\pi}{2} square units

If the area of a circle is $36\pi$, what is its radius?

• 36

• 18

• 12

What is the circumference of a circle with a radius of $14$ cm? (Use $\pi = \frac{22}{7}$)

• 44 cm

• 616 cm

• 28 cm

A bicycle wheel has a diameter of $70$ cm. How far does it travel in one full rotation?

• 70 cm

• 140 cm

• 440 cm

If the circumference of a circle is $20\pi$, what is the diameter?

• 10

• 40

• 5

Find the perimeter of a circle if the radius is $3.5$ units. (Use $\pi = \frac{22}{7}$)

• 11 units

• 38.5 units

• 7 units

Which formula is used to find the perimeter (circumference) of a circle?

• \pi r²

• 1/2 bh

• \pi r