7th Math 7.9B, 7.9C, 7.11C

Front

What is the formula to find the area of a circle?

Back

Area = πr², where r is the radius of the circle.

Front

How do you find the area of a square?

Back

Area = side × side, where 'side' is the length of one side of the square.

Front

What is the relationship between the radius and diameter of a circle?

Back

Diameter = 2 × Radius.

Front

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

Back

Diameter = 2 × 9.5 mm = 19 mm.

Front

What is the area of a circle with a radius of 7 cm?

Back

Area = π(7 cm)² ≈ 153.94 cm².

Front

How do you calculate the area not covered by a circle inside a square?

Back

Subtract the area of the circle from the area of the square.

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14.

Front

If the area of a circle is 153.86 cm², what is the radius?

Back

Radius = √(Area/π) ≈ 7 cm.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.

Front

What is the area of a square with a side length of 10 cm?

Back

Area = 10 cm × 10 cm = 100 cm².