6.7ab pi/circumference/area problems and practical problems

The number pi ________________

• has only 3 digits
• never ends  &  never repeats 
• ends eventually
  (it is just a really long number)

What number is pi?

• 1.41...

• 2.00...

• 3.14...

• 5.14...

Tags

TEKS.MATH.7.8C

π is a ratio.

It compares a circle's circumference

to its _________________.

• radius

• diameter

• area

• itself

Tags

TEKS.MATH.7.9B

The diameter of a circular pool is 24.8 feet and the circumference is 77.9 feet. What should you do to find π?

• 77.9 / 24.8

• 24.8 / 77.9

Tags

TEKS.MATH.7.8C

What is the diameter of a circle with a radius of 3 feet?

• 9.42 feet
• 18.84 feet
• 6 feet
• 12 feet

What is the radius of a circle with a diameter of 45 miles?

• 22.5 miles
• 141.3 miles
• 282.6 miles
• 90 miles

The distance halfway across the circle is called the...

• radius
• diameter
• circumference
• area

To go from diameter to radius, what do I need to do?

• divide by 3.14
• multiply by 3.14
• multiply by 2
• divide by 2

What is the formula for finding the circumference of a circle?

• C = r²

• C = rd

• A = π·r²

• C = π·d

Tags

TEKS.MATH.7.9B

What is the formula for finding the area of a circle?

• A = π·d

• C = 2·π·r

• A = π·r²

• C = π·d

Tags

TEKS.MATH.7.9B