Unit 8 Part 2- Area & Circumference Review

Front

What is the formula for the area of a rectangle?

Back

Area = length x width

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 x base x height

Front

What is the formula for the area of a circle?

Back

Area = pi x r^2

Front

What is the formula for the circumference of a circle given the radius?

Back

C = 2 x pi x r

Front

What is the formula for the circumference of a circle given the diameter?

Back

C = pi x D

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 x radius

Front

What is the circumference of a circle with a diameter of 10 cm?

Back

C = pi x 10 cm ≈ 31.42 cm

Front

What is the area of a circle with a radius of 5 cm?

Back

Area = pi x (5 cm)^2 ≈ 78.54 cm²

Front

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

Back

The area increases by a factor of 4.

Front

What is the area of a square with a side length of 4 cm?

Back

Area = 4 cm x 4 cm = 16 cm²