11.3 FLASHACARDS optional Practice (FLASHCARDIZZ)

Front

What is the formula to calculate the diameter of a circle?

Back

Diameter = 2 × Radius

Front

If the radius of a circle is 4 inches, what is the diameter?

Back

8 inches

Front

What is the formula for the area of a circle?

Back

Area = π × Radius²

Front

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

Back

78.54 inches² (using π ≈ 3.14)

Front

What type of triangle has angles of 45°, 45°, and 90°?

Back

45°-45°-90° triangle

Front

What is the relationship between the sides of a 30°-60°-90° triangle?

Back

The sides are in the ratio 1 : √3 : 2.

Front

What is the distance from any point on the outside of a circle to the center of the circle called?

Back

Radius

Front

What is the formula for the area of an equilateral triangle?

Back

Area = (√3/4) × side²

Front

Calculate the area of a regular triangle (equilateral) with a side length of 10 cm and an apothem of 8.66 cm.

Back

129.9 cm²

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × Radius