7th Grade Circles 4/13 WARMUP: >80% means KAHOOT :)

Front

What is the radius of a circle?

Back

A line from the center point to the edge of the circle.

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius.

Front

How do you calculate the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.

Front

What does π (pi) represent in circle calculations?

Back

π is a constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Front

If the radius of a circle is 9 inches, what is the area?

Back

Area = π(9)² = 81π in².

Front

If the radius of a circle is 1.5 feet, what is the circumference?

Back

Circumference = 2π(1.5) = 3π feet.

Front

What is the diameter of a circle?

Back

The diameter is a line that crosses through the center and touches each edge, equal to 2 times the radius.

Front

If a circle has a circumference of 6π cm, what is its radius?

Back

Radius = Circumference / (2π) = 6π / (2π) = 3 cm.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius (Diameter = 2 × Radius).

Front

How do you find the cost of edging for a circular garden?

Back

Calculate the circumference and multiply by the cost per foot.