7th Math 7.9B, 7.9C, 7.11C

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × radius

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius

Front

How do you calculate the area of a circle?

Back

Area = π × radius²

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14

Front

If the radius of a circle is 9.5 mm, what is the diameter?

Back

Diameter = 19 mm (2 × 9.5 mm)

Front

What is the definition of radius in a circle?

Back

Radius is the distance from the center of the circle to any point on its circumference.

Front

What is the definition of diameter in a circle?

Back

Diameter is the distance across the circle through its center, equal to twice the radius.

Front

If a circle has a circumference of 50 cm, what is the radius?

Back

Radius = 50 cm / (2 × π) ≈ 7.96 cm

Front

What is the measure of a right angle?

Back

A right angle measures 90 degrees.

Front

What is the sum of angles in a triangle?

Back

The sum of angles in a triangle is always 180 degrees.